Suffolk County police were called to the upscale Montauk Yacht Club around 4 a.m. on reports of a woman’s body found on the boat off Star Island Road, and dispatched detectives to the grisly scene.

Cops have not identified the body, a department spokesman told The Post.

“The woman’s cause and manner of death have yet to be determined,” he said.

Violent crime is rare in Montauk, a popular beach resort on the tip of Long Island known for waterfront mansions and a thriving summer tourist industry.

This is a developing story. Please check back for updates.