Marina Gajcin (born 8 April 2001) is a Serbian chess player who holds the title of Woman Grandmaster, which she earned in 2023.
Gajcin represented Serbia in the 2022 Women's Chess Olympiad, finishing on 6/8 on board 4.
Gajcin won the women's section of the 2023 Serbian Chess Championship, finishing on 7.5/9, two points ahead of second place.
She qualified for the Women's Chess World Cup 2023, where she was defeated by Govhar Beydullayeva in the first round.