Siegl is a surname. Notable people with the surname include:
Antonín Siegl (born 1880, date of death unknown), Czech sports shooter Dietrich Siegl (born 1954), Austrian actor Franz Siegl (born 1955), Austrian bobsledder Hans Siegl (1944–1978), international speedway rider Harald Siegl (born 1972), Austrian equestrian Horst Siegl (born 1969), Czech professional footballer Lea Siegl (born 1998), Austrian equestrian Patrik Siegl (born 1976), Czech football player Philipp Siegl (born 1993), Austrian football player Siegrun Siegl (born 1954), East German athlete Zev Siegl (born 1942), American keynote speaker and presenter