The 1964–65 1.Lig was the seventh season of professional football in Turkey.
Fenerbahçe won their fourth title, becoming the first club to win four league titles.
Göztepe qualified for participation at the Inter-Cities Fairs Cup.
Metin Oktay finished top scorer with 17 goals, winning his fifth Gol Kralı award.
Altınordu were the only club relegated, while newly promoted Şeker Hilal finished one point above relegation.