Mersin İdmanyurdu (also Mersin İdman Yurdu, Mersin İY, or MİY) Sports Club; located in Mersin, east Mediterranean coast of Turkey in 1980–81. The 1980–81 season was the 10th season of Mersin İdmanyurdu (MİY) football team in First League, the first level division in Turkey. They have relegated to second division at the end of the season. It was third time the team relegated. The club signed with coach İsmet Arıkan. Arıkan's assistant was conditioner Seyfi Alanya.