Michael Diethelm (born 24 January 1985) is a footballer from Switzerland.
He currently plays as a defender for SC Cham in the Swiss 1.
Liga.
He previously played for FC Luzern in the Swiss Super League and for FC Wohlen.
Diethelm is a former youth international and was in the Swiss U-17 squad that won the 2002 U-17 European Championships.