Mario Šitum (born 4 April 1992) is a Croatian professional footballer who plays for Italian Serie B club Catanzaro.

Šitum's senior career began when he was promoted from the Dinamo Academy to the first team in 2011, making his first-team debut in the same year in a 3–0 win over Czech side Sigma Olomouc.

On 19 February 2011 he started and played 75 minutes in a friendly against NK Istra 1961, which Dinamo won 4–3 at the newly renovated Stadion Aldo Drosina in Pula.

Šitum started the match and scored in the 12th minute, a goal which turned out to be the game winner.

In May 2015 he received a call-up to the senior Croatia squad for the friendly against Gibraltar and for a Euro 2016 qualifier game against Italy.