Karl (Charly) Mai (27 July 1928 – 15 March 1993) was a German footballer who played as a midfielder.

He was part of the West Germany national team that won the 1954 FIFA World Cup.

Sepp Herberger compared Mai's playing style to that of 1930s player Andreas Kupfer but also appreciated his solidity and straightness.

In the 1954 World Cup Final Mai faced Sandor Kocsis who had scored no less than 11 goals up to that game, yet he failed to score in the final as Mai performed a rigid marking job on Kocsis.

This biographical article related to association football in Germany, about a midfielder born in the 1920s, is a stub.