A woman was shot in the head in a broad daylight attack Wednesday in Brooklyn, cops said.

The gunfire erupted just before 1 p.m. at St. Marks Place and 4th Avenue in Park Slope, police said.

“I heard one shot and knew it was from a gun,” said local bodega cashier, Mohammed Ali.

Ali, 57, said he ran outside and saw, “a lady lying face-up on the sidewalk and above her eyes was a hole with blood coming out.”

“I’ve been working here for 12 years and I’ve never seen anything like this,” he said. “It’s scary. If the bullet hadn’t hit her, I might have been the one hit.”

The victim, Nichelle Thomas, 52, was rushed to a Presbyterian hospital, where she died, cops said.

Hours later, the suspected shooter surrendered to cops at the 78th Precinct stationhouse with her lawyer.

The shooting was the first recorded in the neighborhood this year, NYPD data shows, and comes as the Big Apple experiences a nearly yearlong surge of gun violence.

The mayor’s office announced a plan Tuesday to try to curb the gunplay during the summer when cities historically see an uptick — but mirrored the failed policing strategy from last year.

Andrea Iglesias, 52, told The Post as he looked on the latest act of bloodshed, “it’s unreal what’s happening in this city.”

“This is a good area. People don’t get shot here, especially in broad daylight on a busy intersection. There’s so little enforcement anymore, people feel emboldened.”