- Category : Footballer
- Type : GP
- Profile : 5/1 - Heretical / Investigator
- Definition : Single
- Incarnation Cross : LAX Prevention 2
Etienne Mattler (25 December 1905 – 23 March 1986) was a French international footballer, nicknamed Le Lion de Belfort.
Mattler, born in Belfort, played for the clubs US Belfort (1921–1927), Troyes AC (1927–1929), and FC Sochaux (1929–1946) where he won two Ligue 1 titles in 1935 and 1938 and one Coupe de France in 1937.
For the national team, he won 46 caps and participated in the 1930, 1934 and 1938 World Cups, being one of five players to have appeared in all three of the pre-war World Cups. He died at 80 years old.