Mersin İdmanyurdu (also Mersin İdman Yurdu, Mersin İY, or MİY) Sports Club; located in Mersin, east Mediterranean coast of Turkey in 1990–91. Mersin İdmanyurdu (MİY) participated in Second League in 1990–91 season for the 17th time and finished third. The team also participated in Turkish Cup (Federasyon Kupası) in 1990–91 and eliminated at Round 2.

Club president was Kaya Mutlu. Kadri Aytaç was head coach. Most appeared player was Sinan Turhan with 31 appearances. Sinan Turhan was also top goalscorer with 15 goals.

Mersin İdmanyurdu took place in 1990–91 Second League season. League was played by 53 teams in three groups, two with 18 teams and one with 17 teams. Bottom three teams in each group were relegated to Third League, whereas top teams in each group were promoted to First League at the end of the season.

Mersin İdmanyurdu took place in 1990–91 Second League in Group C and finished 3rd with 19 wins and 69 goals.

Mersin İdmanyurdu (MİY) 1990–91 Second League season in Group C league summary:

Mersin İY's league performance in 1990–91 Second League Group C season is shown in the following table.

Results of games MİY played in 1990–91 Second League Group C by rounds:

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