Marijonas Petravičius (born October 24, 1979) is a Lithuanian retired professional basketball player.

In 2008 the team was competing in the EuroLeague, and in his first game Petravičius scored 29 points against Armani Jeans Milano.

With the club's three leaders injured: himself, Matthew Nielsen and Roberts Štelmahers, Rytas failed to enter the EuroLeague quarterfinals.

[2][3] In August 2011, he agreed to terms with the Turkish team Beşiktaş Cola Turka Istanbul.

[9] Petravičius was a member of the senior Lithuanian national basketball team at the 2008 Summer Olympics tournament, where Lithuania finished in 4th place.