Leonhard "Lony" Seiderer (1 November 1895 – 3 July 1940) was a German football forward who played for 1.
FC Nürnberg and SpVgg Fürth.Seiderer started his career with Nürnberg before joining Fürth in 1917.
He played 196 league games for the club, scoring 130 goals, and won the German football championship in 1926.
He also represented the German national team, winning eight caps and scoring five goals between 1920 and 1924.He later coached Germania Nürnberg, ASV Nürnberg, Wacker München, 1.