IIHF World Championship

The IIHF considers the ice hockey tournament held at the 1920 Summer Olympics to be the first Ice Hockey World Championship. It was organized by a committee that included future IIHF president Paul Loicq. The tournament was played from 23 to 29 April. Seven teams participated: Canada, Czechoslovakia, the United States, Switzerland, Sweden, France and Belgium. Canada, represented by the Winnipeg Falcons, won the gold medal, outscoring opponents 27–1. The United States and Czechoslovakia won the silver and bronze medals respectively. Following the 1921 Olympic Congress in Lausanne, the first Winter Olympics were held in 1924 in Chamonix, France, though they were only officially recognized by the International Olympic Committee (IOC) as such in the following year.

Subsequently, every Olympic tournament up to and including the 1968 Winter Olympics is counted as the World Championship. Canada won the gold medal at both the 1924 and 1928 Winter Olympics. In 1928, the Swedish and Swiss teams won their first medals–silver and bronze, respectively–and a German team participated for the first time, finishing ninth.

The first World Championship that was held as an individual event was in 1930. It was held in Chamonix, France; Vienna, Austria; and Berlin, Germany. Canada, represented by the Toronto CCMs, defeated Germany in the gold medal game, and Switzerland won the bronze. Canada, represented by the Manitoba Grads, won the following year, and the Winnipeg Winnipegs won Gold for Canada at the 1932 Winter Olympics. At the 1933 World Championships in Prague, Czechoslovakia, the United States won the gold medal, becoming the first non-Canadian team to win the competition. As of 2023, it is the only gold medal the United States has won at a non-Olympic tournament. Two days before the 1936 Winter Olympics in Germany, Canadian officials protested that two players on the British team—James Foster and Alex Archer—had played in Canada but transferred without permission to play for clubs in the English National League. The IIHF agreed with Canada, but Britain threatened to withdraw if the two could not compete. Canada withdrew the protest before the games started. Britain became the first non-Canadian team to win Olympic gold, with the United States taking bronze. Canada won the remainder of the World Championship tournaments held in the 1930s. The 1939 World Championships marked the first time that a team from Finland competed in the tournament. World War II forced the cancellation of the 1940 and 1944 Winter Olympics and the World Championships from 1941 to 1946.

Following World War II, Czechoslovakia's team was quickly improving. They won the 1947 World Championships, although a Canadian team had not participated in the event. In 1949, they became the third nation to win a World Championship tournament that Canada participated in. During the run-up to the 1948 Winter Olympics in St. Moritz, Switzerland, a conflict broke out with the two American hockey bodies: the American Hockey Association (AHA, a forerunner to USA Hockey) and the Amateur Athletic Union (AAU). The AAU refused to support the AHA's team because they believed that AHA players were "openly paid salaries" and at the time, the Olympics were strictly for amateur players. A compromise was reached that the AHA team would be allowed to compete but would be considered unofficial and unable to win a medal. By the end of the tournament, the AHA team finished fourth in the standings. Both Czechoslovakia and the RCAF Flyers of Canada won seven games and tied when they played each other. The gold medal winner was determined by goal average: Canada won the gold because they had an average of 13.8 compared to Czechoslovakia's average of 4.3.

At the 1952 Winter Olympics in Oslo, Norway, the Edmonton Mercurys won Canada's second consecutive Olympic gold medal and their 15th World Championship in 19 competitions. It was the last time that a Canadian team would win an Olympic gold medal in hockey for 50 years. At the 1953 tournament, reigning champion Canada did not attend, while the team from Czechoslovakia withdrew because of the death of the General Secretary of the Communist Party of Czechoslovakia, leaving only Sweden, West Germany, and Switzerland competing in the top division. Sweden finished the tournament undefeated and won their first World Championship.

The 1954 World Championships has been described by the IIHF as "the start of the modern era of international hockey." The tournament saw the first participation of the Soviet Union in international competition. The Soviet Union had organized its first ice hockey league in 1946, having previously focused on bandy. Led by coach Arkady Chernyshev, the Soviet national team finished their first six games undefeated. Canada, represented by the East York Lyndhursts, was also undefeated and, in the final game of the tournament, the two teams met for the first time in international competition. The Soviet Union won the game 7–2, becoming the fifth team to win a World Championship tournament. The 1955 World Championship was held in West Germany, and the two teams again met in the final game of the tournament. The game was so high profile in Canada that announcer Foster Hewitt flew to West Germany to provide play-by-play coverage. Both teams were undefeated and Canada, represented by the Penticton Vees, defeated the Soviets 5–0 to reclaim the World Championship. At the 1956 Winter Olympics in Cortina d'Ampezzo, Italy, Canada's Kitchener-Waterloo Dutchmen lost to both the Soviets and the United States in the medal round and won the bronze. The Soviets went undefeated and won their first Olympic ice hockey gold medal. It would be seven years until the Soviet Union won another World Championship.

The 1957 World Championships were held in Moscow. Canada and the United States did not participate in protest of the Soviet occupation of Hungary. Most of the games were held in the Luzhniki Sports Palace, but the Soviet officials decided to hold the final game in a nearby outdoor soccer stadium. The game was attended by at least 55,000 people, which stood as a World Championship attendance record until 2010. In the final game, Sweden edged the Soviet Union to finish with six wins and one tie (the Soviet Union had five wins and two ties) and won the gold medal. Canada returned to the World Championship in 1958 and won two consecutive titles, with the Soviets winning silver both times. At the 1960 Winter Olympics in Squaw Valley, California, Canada, the Soviet Union, Czechoslovakia and Sweden were the top four teams heading into the Games. All four were defeated by the American team, which won all seven games en route to its first Olympic gold medal.

In 1961, Czechoslovakia defeated the Soviet Union and tied Canada to make it a three-way race for gold. In the final game, Canada defeated the Soviets 5–1 to win their nineteenth gold medal. The Trail Smoke Eaters became the final club team to represent Canada. The following year, Canada implemented a national team program, led by Father David Bauer. Canada would not win another world championship gold until 1994. In 1962, the World Championships were held in North America for the first time. The tournament was held in Denver, United States, and was boycotted by the Soviet and Czechoslovak teams. Sweden defeated Canada for the first time in the history of the competition and won their third gold medal.

At the 1963 World Championships in Stockholm, the Soviet Union won the gold medal, beginning a streak of nine consecutive World Championship golds. The 1964 Winter Olympics in Innsbruck, Austria marked the first time that Canada failed to win an Olympic medal in hockey. The Soviet Union won all seven of their games and the gold medal, but Canada finished the tournament with five wins and two losses, putting them in a three-way tie for second place with Sweden and Czechoslovakia. Prior to 1964, the tie-breaking procedure was based on goal difference from games against teams in the medal round and under that system, Canada would have placed third ahead of the Czechoslovaks. The procedure had been changed to count all games and that meant the Canadians finished fourth. However, the Olympics also counted as the World Championships, and under IIHF rules, Canada should have won a World Championship bronze. In April 2005, the IIHF admitted that a mistake had occurred and announced that they had reviewed the decision and would award the 1964 Canadian team a World Championship bronze medal. However, two months later, the IIHF over-turned their decision and rejected an appeal in September.

The Soviets dominated the remainder of the decade. Following 1963, the team went undefeated in Olympic and World Championship competition for four years. Their streak was broken by Czechoslovakia at the 1968 Winter Olympics. Despite the loss, the Soviets still won gold. It was the last time that the Olympics were also counted as the World Championships. In 1969, the Soviet Union and Czechoslovakia played "the most emotionally charged games in the history of international hockey." The rights to host the tournament had originally been awarded to Czechoslovakia but they were forced to decline the rights following the Soviet-led Warsaw Pact invasion of the nation in August 1968. The tournament was held in Stockholm, Sweden, and with these international tensions, the Czechoslovak team was determined to defeat the Soviets. They won both of their games 2–0 and 4–3 but despite these wins, the Czechoslovaks lost both of their games to Sweden and won bronze.

With European teams using their best players who are de facto professionals, the Canadian Amateur Hockey Association (CAHA) felt their amateur players could no longer be competitive and pushed for the ability to use players from professional leagues. At the IIHF Congress in 1969, the IIHF voted to allow Canada to use nine non-NHL professional players at the 1970 World Championships. The rights to host the tournament were awarded to Canada for the first time–in Montreal and Winnipeg. However, the decision to allow the use of professionals was reversed in January 1970. IOC president Avery Brundage was opposed to the idea of amateur and professional players competing together and said that ice hockey's status as an Olympic sport would be in jeopardy if the change was made. In response, Canada withdrew from International ice hockey competition. Canada's ice hockey team did not participate in the 1972 and 1976 Winter Olympics. Canada also waived their rights to host the 1970 World Championship, so it was held in Stockholm, Sweden instead.

Led by goaltender Vladislav Tretiak and forwards Valeri Kharlamov, Alexander Yakushev, Vladimir Petrov and Boris Mikhailov, the Soviet Union won gold at the 1970 and 1971 World Championships and the 1972 Winter Olympics. 1972 marked the first time that both the Olympics and World Championships were held in the same year as separate events. At the World Championships in Prague, the Czechoslovak team ended the Soviet team's streak and won their first gold since 1949. The Soviet team quickly returned to their winning ways, winning 1973 and 1974 World Championships. However, during the latter tournament, the Czechoslovak team defeated the Soviets 7–2. It was one of the biggest margins the Soviet team had ever lost by in an official game. The 1976 World Championships were held in Katowice, Poland. On the opening day of the tournament, Poland defeated the Soviet Union 6–4 thanks to a hat-trick from forward Wieslaw Jobczyk and the goaltending of Andrzej Tkacz. It was one of the biggest upsets in international hockey history; two months earlier at the 1976 Winter Olympics, Poland had lost 16–1 to the Soviets. The Soviets lost two more games and won the silver, and Czechoslovakia won gold. Poland finished seventh and was relegated to Pool B, the division in which teams play for ranking purposes and not the championship (now known as Division I).

Günther Sabetzki became president of the IIHF in 1975 and helped to resolve the dispute with the CAHA. The IIHF agreed to allow "open competition" of all players in the World Championships, and moved the competition to later in the season so players not involved in the NHL playoffs could participate. However, NHL players were still not allowed to play in the Olympics, because of both the unwillingness of the NHL to take a break mid-season and the IOC's strict amateur-only policy. The IIHF also agreed to endorse the Canada Cup, a competition meant to bring together the best players from the top hockey-playing countries.

The 1976 World Ice Hockey Championships in Katowice were the first to feature professionals although in the end only the United States made use of the new rule, recalling eight pros from the NHL's Minnesota North Stars and the WHA's Minnesota Fighting Saints. The first fully open World Championship was held in 1977 in Vienna, Austria, and saw the first participation of active Canadian NHL players, including two-time NHL MVP Phil Esposito. Sweden and Finland also augmented their rosters with a few NHL and WHA players. Many of the players on the Canadian team were not prepared for the tournament and were unfamiliar with the international game. The team finished fourth, losing both games to the Soviet Union by a combined score of 19–2. Czechoslovakia won gold, becoming the third team (after Canada and the Soviet Union) to win consecutive championships.

As a result of these events, full world championship status was given to the IIHF World Under-20 Championship, which had been held annually since 1974 as an unofficial invitational tournament. Colloquially known as the World Junior Ice Hockey Championship, the event was structured after the World Championships, but limited to players under the age of 20. The World Under-18 Championship was established in 1999 and typically held in April. It usually does not involve some of the top North American-based players because they are involved in junior league playoffs at the time.

Starting in 1978, the Soviet team won five consecutive World Championships, and had an unbeaten streak that lasted from 1981 through the 1984 Winter Olympics and until 1985. During that period, Canada remained competitive, winning three bronze medals. World Championship tournaments were not held in 1980, 1984 or 1988–the Olympic years.

The 1987 World Championships in Vienna were over-shadowed by several controversies. At the beginning of the tournament, the roster of the West German team included Miroslav Sikora, a Polish-German forward who had previously played for Poland at the 1977 World Under-20 Championship. Sikora became a naturalized citizen of West Germany and played in the first three games, scoring a goal in a 3–1 win over Finland. Following the game, Finland launched a protest, demanding that the result be over-turned because the West Germans had used an ineligible player. At the time, players were not allowed to switch nationalities under any circumstances and the IIHF agreed to overturn the result and award the two points to Finland. This angered West German officials, who filed a protest in an Austrian court. The court agreed with the West Germans, overturning the IIHF decision and allowing them to keep their points. The result affected the final standings because had the IIHF's decision stood, Finland would have advanced to the medal round instead of Sweden. However, the Finns finished out of the medal round, and Sweden won their first gold medal since 1962. The tournament format also became controversial because the Soviet Union finished undefeated in the preliminary round but the Swedish team, which had lost three games in the preliminary round, won on goal differential because of a 9–0 win over Canada in the medal round.

Before 1989, players that lived in the Soviet Union, Czechoslovakia, and other nations behind the Iron Curtain were not allowed to leave and play in the NHL. In March 1989, Sergei Pryakhin became the first member of the Soviet national team who was permitted to play for a non-Soviet team. Several Soviet players, including Igor Larionov and Viacheslav Fetisov, wanted to leave and play in the NHL. Soviet officials agreed to allow players to leave if they played one final tournament with the national team. Players agreed to this, and the Soviet Union won its 21st World Championship. Shortly after, Soviet players began to flood into the NHL. Many of the Soviet Union's top players left, including the entire "Green Unit"–Larionov, Fetisov, Vladimir Krutov, Sergei Makarov and Alexei Kasatonov. The following year, the Soviet team won their final title at the 1990 World Championships. In 1991, Swedish forward Mats Sundin–the first European player to be drafted first overall in the NHL–led his team to the gold medal. The Soviets won bronze–the last medal the team would ever win.

The Soviet Union dissolved in December 1991. Nine former Soviet republics became part of the IIHF and began competing in international competitions, including Belarus, Kazakhstan, Latvia (which returned after a 52-year-long absence due to having been occupied by the Soviet Union) and Ukraine; the largest, Russia, succeeded the USSR. With this flood of new teams, the IIHF expanded the number of spots from eight to twelve. From 1963 to 1991, only four teams won a World Championship medal: the Soviet Union, Czechoslovakia (failing to win a medal only three times), Sweden and Canada. The Soviets won a medal in every tournament they participated in (1954 to 1991). At the 1992 World Championships, Sweden won their second consecutive gold. Finland won the silver medal, the nation's first ever World Championship medal (the Finnish team had previously won a silver at the 1988 Winter Olympics).

Czechoslovakia split into the Czech Republic and Slovakia in January 1993. The IIHF recognized the Czech Republic's team as the successor to Czechoslovakia, and it retained its position in the top division while Slovakia's team began in the lowest division (Pool C) in 1994 and was forced to work its way up. Following this, the next decade was dominated by the so-called "Big Six"–Canada, the Czech Republic, Finland, Russia, Sweden and the United States. From 1992 to 1996, five different teams won the World Championship. At the 1993 World Championships, Russia won its first title as an independent nation and the Czech Republic won its first medal (bronze). In 1994, the Canadian team finished the preliminary round undefeated and defeated Finland in the final to win their first World Championship since 1961. The following year in Sweden, the Finnish team won its first ever World Championship. Led by their top line of Saku Koivu, Ville Peltonen and Jere Lehtinen, the Finns defeated rival Sweden in the gold medal game. At the 1995 Pool B championships, Slovakia, led by Peter Šťastný won Pool B and was promoted to the top division, where it has remained ever since. In 1996, the Czech Republic won its first World Championship as a separate country. During this period, the United States was the only one of the "Big Six" not to win the World Championship, although they did win the 1996 World Cup of Hockey and their bronze at that year's World Championship was their first medal since 1962. In the mid-1990s, several new teams such as Slovakia, Latvia, Belarus, Kazakhstan and Ukraine were quickly improving and older nations such as Austria, France, Italy, Norway and Switzerland were at risk of being relegated to Pool B. The IIHF feared that it would lose advertising revenue if that happened, so the number of teams was increased to 16 starting in 1998.

From 1996 to 2001, the Czech Republic won six consecutive World Championship medals, including World Championship gold from 1999 to 2001, as well as gold at the 1998 Winter Olympics. In 2002, the Czechs were favoured to win, but were upset in the quarter final by Russia. In the gold medal game between Russia and Slovakia, Slovakian Peter Bondra scored in the final two minutes of the game and the nation won its first ever World Championship. At the 2003 World Championships, Sweden made one of the biggest comebacks in tournament history, rallying from a 5–1 deficit in their quarterfinal game against Finland to win 6–5. The gold medal game between Canada and Sweden went into overtime. Canada's Anson Carter scored the winning goal 13 minutes into play, but the goal had to be reviewed for ten minutes to determine if the puck had crossed the line. In a rematch of the two nations the following year, Canada won and repeated as champions.

The 2004–05 NHL season was locked out, and eventually cancelled, because of a labour dispute between the league and the players. The 2005 World Championships, which featured more top players than normal, was won by the Czech Republic. At the 2006 Winter Olympics, Sweden won the gold medal over Finland. Three months later, Sweden defeated the Czech Republic and won the 2006 World Championships. They became the first team to win Olympic gold and a separate World Championship tournament in the same year. At the 2007 World Championship in Moscow, Canada defeated Finland to win the gold medal. The following year, the tournament was held in Canada for the first time. Russia defeated the home team to win their first gold medal since 1993. The Russian team successfully defended their title with a 2–1 win over Canada in 2009. In 2009, NHL Players' Association director Paul Kelly suggested that the World Championships be held every other year and that the NHL go on break to allow full player participation. IIHF president René Fasel responded that the tournament has television contracts and hosting commitments and that a large change would be difficult to put in place.

The 2010 tournament took place in Germany. The first game, between Germany and the United States, was played at Veltins-Arena in Gelsenkirchen and was attended by 77,803 people, setting a new record for the most attended game in hockey history. The tournament was noted for having several surprising preliminary round results, including: Switzerland beating Canada for the first time in World Championship play; Norway defeating eventual champions the Czech Republic; and Denmark upsetting Finland and the United States en route to their first ever quarterfinal appearance. The German team, which had finished 15th in 2009 and only avoided relegation to Division I because they were set to host the 2010 tournament, advanced to the semi-finals for the first time since the new playoff format was adapted. They finished fourth, losing to Sweden in the bronze medal game. In the gold medal game, the Czech Republic defeated the Russian team, winning gold.

The 2011 tournament was held in independent Slovakia for the first time. Finland won its second world championship with a 6–1 victory over Sweden. The Czech Republic won the bronze medal over Russia.

The 2012 tournament was held in Sweden and Finland. Russia beat Slovakia in the final, while the Czech Republic beat Finland in the bronze medal game.

In 2013, Switzerland finished the preliminary round undefeated before losing the gold medal game 5–1 to co-hosts Sweden. Switzerland's silver medal was the first for the nation since 1953. Sweden's gold made them the first team to win the tournament at home since the Soviet Union in 1986.

The 2014 tournament was held for the first time in independent Belarus in spite of concerns of the human rights abuses perpetrated by the authoritarian government. The tournament saw more upsets by the less prominent ice-hockey nations. France had beaten Canada for the second time in the modern history and made it to the quarterfinals. Eventual finalist Finland lost to Latvia and made it to the quarterfinals only due to a shootout win over Switzerland. The tournament was won by Russia (which had a stacked NHL squad compared to other teams who sent in younger players after the 2014 Winter Olympics), Finland won silver and Sweden won bronze defeating the Czech Republic.

The 2015 tournament was held in Prague and Ostrava, it was the most attended championship in history. It was to be the last appearance of Jaromír Jágr on the Czech national hockey team, and the home crowd had great expectations for its national team, who had failed to win a gold medal since 2010, matching its longest run without a win since the break-up of Czechoslovakia. However, the tournament was dominated by an excellent Canadian team, which went undefeated and beat Russia 6–1 in the gold medal match. Its captain, Sidney Crosby joined the Triple Gold Club, becoming the first player to achieve that honour as captain of each winning team. The bronze was won by the United States, leaving the Czechs with a second consecutive fourth place.

The 2020 tournament was cancelled due to the COVID-19 pandemic.