Mersin İdmanyurdu (also Mersin İdman Yurdu, Mersin İY, or MİY) Sports Club; located in Mersin, east Mediterranean coast of Turkey in 1965-1966. The 1965–66 season was the 3rd season of Mersin İdmanyurdu football team in Second League, the second level division in Turkey.

The club had had name "Çukurova İdmanyurdu" again under Çukurova Group sponsorship and finished 5th. On 20 July 1965 the club and fans celebrated the 40th anniversary of their foundation. Executive committee comprised Mehmet Karametmet, Halit Gazioğlu, Sezai Sak.

At the beginning of the season Fahrettin Cansever was the coach of the team. In the half season Lefter Küçükantonyadis became the manager of the team (20 January 1966). Lefter signed for four months. One month later, Lefter had been stabbed by a fan (a restaurant owner, Fikri Özkörüklü) and hospitalized. Many citizens, pupils, NGO representatives and sports people visited him in hospital and his room was filled with flowers. Lefter declared that he will not leave the team. Fahrettin Cansever became the trainer of Beykozspor (12 January 1966). On 7 June 1966 before the last match of the season, Lefter left Mersin. He said that he was compliant of the behaviours of executive committee member Sezai Sak.

Second League 1965–66 was played by 22 teams in two groups (red and white), 11 in each. Top four teams played promotion group matches in league format. Bottom teams played relegation play-out. Top two teams promoted to First League 1966–67.

Mersin İdmanyurdu (MİY) 1965–66 Second League league summary:

The 1965–66 season Red Group (stage 1) matches of Çukurova İdmanyurdu (ÇİY) vs other team are shown in league table below.

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