Mario Leitner (born 2 February 1997) is an Austrian slalom canoeist who has competed at the international level since 2012.

[4] He won a bronze medal in kayak cross at the 2021 World Championships in Bratislava.

Leitner finished 13th in the K1 event at the 2016 Summer Olympics in Rio de Janeiro.

In 2014 he won the Austrian Youth Sports Award after winning a gold medal at the junior world championships.

His older sister Lisa also competes in canoe slalom.