Mersin Idman Yurdu U21

Mersin İdman Yurdu is one of the oldest clubs of the Mediterranean region. The club was founded on 16 August 1925 as Mersin Gençlerbirliği (English: Mersin Youth Union) during a meeting between Edip Buran and his friends İbrahim Yekta, Fevzi Serdengeçti, Asım Güler, Muhip Batıbeki, Necati Salim, Lütfi Resimci, Sami İstanbullu, Hayri Güntekin, Hakkı Cemal Üçer, Hasan Tahsin, and Mustafa Lütfi. Their aim was to provide Mersin's youth with activities to fill their spare time with sports during long, hot summer days in Mersin. Later, the club obtained a license with the participation of other founders, namely İbrahim Bigam, İhsan Dağıstan, Hamit Abey, Rauf Süleymaniyeli, Semih Can, Ömer, Cevdet Türkmenli, Kazım Kırzade, and Muharrem Yeğin.

The first colors of the team were red and white. The club changed its name to Mersin İdman Yurdu in 1926, and their colors were changed to red and dark blue. The logo was established as three connected circles, the center circle in red and the left and right circles in dark blue.

Mersin İdman Yurdu had won the regional title every year since its foundation until 1964, except during the 1949–50 season when Mersin Demirspor captured the title. In 1944, the team reached the third place in the Turkish Football Championship. In 1952, the club inaugurated their new stadium, Tevfik Sırrı Gür Stadyumu, by playing an opening match that was tied 3–3 with Galatasaray.

In 1957, the club became sponsored by the Çukurova Group and adopted the name Çukurova İdmanyurdu. The team again finished third in the Turkish Amateur Championship. Çukurova İdmanyurdu, as "a rather well-known amateur club from the city of Mersin", turned professional and was promoted to Turkey's first second level league founded in 1963. Çukurova İdmanyurdu again became the amateur champions of Turkey in 1963. When they became a part of the Turkish second division they were one of only three clubs that came from outside of the major cities of Istanbul, Ankara, and İzmir, the other clubs being Adana Demirspor and Bursaspor.

In June 1966, the club changed its name to Mersin İdman Yurdu after three seasons and became champions of the Turkish second division in the 1966–67 season. At the end of that season they won the Prime Minister's Cup by defeating the Amateur League champions. Beginning in the 1967–68 season they played in the Turkish top level division (Süper Lig) for 7 consecutive years and 11 years in total.

After the 1982–83 season, MİY was relegated from the Süper Lig. They played in the second division until the formation of a one-group second level division in 2001–02. Because of their place in the 2000–01 season they were automatically relegated to third level formed under the name of "Second League, Category B". They spent one season there and were promoted to the second division (Second League, Category A). After the 2005–06 season, they were relegated to the third division again.

In 2008, Ali Kahramanlı was elected president of the club. They finished the 2008–09 season in the TFF Second League playoffs in second place and advanced to the second division, now with the name TFF First League, also known as Bank Asya 1. Lig. After spending two seasons in the TFF First League, MİY became the champions of 2010–11 Bank Asya 1. Lig and were promoted to 2011–12 Süper Lig after being absent from the Süper Lig for 28 years. Their championship was widely attributed to coach Nurullah Sağlam, who took over the team after the 9th week during that season. They finished Süper Lig as 12th in the 2011–12 season but relegated again to First League after finishing 18th or last in the 2012–13 season. MİY finished the First League as 6th and qualified for the promotion play-offs in the 2013–14 season. They beat Orduspor 3–0 on aggregate and 2–0 Samsunspor and returned to top level at the first attempt. MİY finished the 2014-15 season as seventh. However, next season was a disaster for MİY due to financial problems. Eventually MİY relegated to second level after a 2-0 defeat to Çaykur Rizespor on 29 April 2016.

After the city of Mersin hosted the 2013 Mediterranean Games, there was an urgent need to build a modern stadium in the city. After the games were over, the club started to use the stadium for their league games. The stadium has a capacity of 25,534 people and it is one of the most modern stadiums in Turkey.