Marija Šestak, Serbian-Slovenian triple jumper
Marija Šestak (Serbian Cyrillic: Марија Шестак; born Martinović, Мартиновић) is a Serbian-born Slovenian triple jumper.

Marija Martinović was born on 17 April 1979 in Kragujevac (at the time SR Serbia, SFR Yugoslavia). She is married to Slovenian 400 metres runner Matija Šestak. She was granted Slovenian citizenship on 13 July 2006.

Her personal best jump is 15.08 metres, achieved on 13 February 2008 in Athens. This is the current national record for Slovenia, beating the seven-year-old record of Anja Valant. She also has 6.50 metres in the long jump.