An off-duty NYPD cop was stabbed by his girlfriend Sunday night while the two argued outside the officer’s Staten Island home, police said.

Marisol Ramirez, 28, allegedly knifed her boyfriend around 9:15 p.m., while the two were quarreling, cops said.

The unidentified 28-year-old officer was treated and released from Staten Island University Hospital, police said.

Ramirez was arrested and charged with felony assault, menacing, and criminal possession of a weapon, according to police.