A man was shot in the leg when a gunman opened fire at an Upper West Side playground last night, cops said.

Shots rang out at around 10:45 p.m. at a playground at the Amsterdam Houses, on Amsterdam Avenue near West 63rd Street.

The unidentified victim was hit in the thigh and taken to St. Lukes Hospital in stable condition, authorities said.

Cops said the shooter is still on the loose.