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.

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