A deranged man defecated on a gay pride flag at a Manhattan tapas bar — and then used another rainbow banner to clean himself off — in a suspected hate crime, cops said.

The disgusting incident happened at Buceo 95 at West 95th Street and Amsterdam Avenue on the Upper West Side around 10 a.m. on April 15.

The man entered the restaurant, took a dump on the flag and then took a second Pride flag “and wiped his backside with it,” according to police.

He then fled north on Amsterdam Avenue.

Cops are looking for the suspect and released video of him near the scene.

He is described as being approximately 40 years old and standing about 6 feet tall. He was last seen wearing a black hat, dark-colored jacket and light-colored pants. He was also wearing one dark-colored sneaker and one white sneaker, cops said.

The NYPD Hate Crimes Task Force is investigating.