Sergiu Postică (born May 17, 1985) is a Moldovan former swimmer, who specialized in breaststroke events.

Postică made his first Moldovan team at the 2004 Summer Olympics in Athens, where he competed in the men's 200 m breaststroke.

[2][3] At the 2008 Summer Olympics in Beijing, Postică qualified for the men's 100 m breaststroke by eclipsing a FINA B-standard entry time of 1:03.71 from the Russian Open Championships in Saint Petersburg.

[4] He challenged five other swimmers on the second heat, including two-time Olympian Nguyễn Hữu Việt of Vietnam.

Postică failed to advance into the semifinals, as he placed fifty-fourth overall on the first night of preliminaries.