Denizlispor U21

Denizlispor Kulübü was founded on May 26, 1966, as a merger of two smaller youth sports clubs, Çelik Yeşilspor Gençlik and Pamukkale Gençlik. They joined to form what is now Denizlispor, which was at the time a lesser known sports & youth club in the Çaybaşı district of Denizli city. This union made its registration at the Turkish football's governing body, the Turkish Football Federation (TFF) under the name of Denizlispor Youth Club. The new football team joined Turkish football's 2nd division for the upcoming season on July 14, 1966.

Denizlispor finished fifth in the 2001–02 Süper Lig, consequently qualifying for the UEFA Cup. In the 2002–03 UEFA Cup, the team defeated FC Lorient, Sparta Prague, and Olympique Lyonnais, before losing in the fourth round against FC Porto, who later on won the tournament. In the 2003–2004 season the black-green club managed another 5th spot. Denizlispor's form declined after the 2004–2005 season and struggled avoiding relegation. Denizlispor drew 1–1 against Fenerbahçe on the last match day of the 2005–06 season securing its stay at the highest level, upsetting the title chances of the team from Kadıköy. Denizlispor remained in the Super League despite a 3–0 loss against Ankaragücü in an away match on May 24, 2009, due to better results against Konyaspor, who got relegated. Denizlispor eventually relegated the next season to the TFF First League after a goalless home draw against Ankaragücü on April 24, 2010.

After the relegation in the 2009–10 season, Denizlispor competed in the TFF First League for nine seasons. In the 2010–11 season, Denizlispor completed the first half of the season as leaders. The team, however, finished the season in 9th place. The following seasons, Denizlispor did not achieve any substantial success. Denizlispor became champions in the 2018–19 TFF First League season, with 72 points, promoting to the Süper Lig.

After two consecutive seasons in the Süper Lig, Denizlispor could not manage to keep competing in the top-tier, relegating to the TFF First League. In the 2022–23 season, The Roosters had a disastrous start to the season with just six points in their first 16 fixtures, performing poor throughout the season staying in the relegation zone in 36 of the 38 rounds. The team relegated in the end to the TFF Second League for the first time ever in their history. The free fall of the Aegean team continued as it relegated in the 2023–24 season from the TFF 2. Lig to the TFF Third League, where it could not hold on, finally relegating from the professional football leagues to the Turkish Regional Amateur League at the end of the 2024–25 season.