Nikola Aćin (born 19 December 1999) is a Serbian swimmer.

He competed in the men's 4 × 100 metre freestyle relay event at the 2020 Summer Olympics together with Andrej Barna, Uroš Nikolić and Velimir Stjepanović.

[1] They finished 10th with time 3:13.71, setting the new Serbian national record.

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