A Brooklyn lesbian ​is suing the city saying an off​-​duty cop attacked her as she walked home from a concert with her girlfriend in July and​ shouted homophobic slurs​ at the couple.

Aspiring filmmaker Stephanie Dorceant claims ​in her Brooklyn federal lawsuit that ​she was ​walking home with her partner, Nandi Allman, on July 7 when off duty ​O​fficer Salvator Aquino bumped into her from behind.

“When Ms. Dorceant asked Police Officer Aquino whether he was ‘alright’ he responded in sum and substance ‘mind your own business you f—— dyke,'” according to ​the suit filed Monday.

​The suit names the city, ​Aquino and several unnamed cops, ​and claims Dorceant “asked police officer Aquino not to speak to her in that disrespectful and offensive manner.”

Aquino then “repeatedly punched her in the face, ripped her shirt and choked her,” according to the complaint.

“Ms. Dorceant suffered bruising and swelling to her face and neck, burst blood vessels in her eyes, abrasions and contusions to her arms and legs and pain to her body,” according to the suit. “Police officer Aquino continued his assault on Ms. Dorceant as she grew increasingly fearful for her life.”

As Allman tried to intervene, several other cops from the 63 precinct arrived at the scene and placed both women on the ground before handcuffing and arresting them.

Allman was eventually freed without charges while cops claimed Dorceant instigated the fight and hit her with a slew of raps, including assault, attempted assault, resisting arrest, menacing, and harassment.

After she was processed, Dorceant was treated at Kings County Hospital before being taken to Riker’s Island, court papers state. She eventually testified in front of a Grand Jury last month and the panel dismissed all criminal charges against her, according to the complaint.

In a joint suit, Dorceant and Allman are suing for a slew of civil rights violations, including battery, false arrest, and “bias-based profiling.”

“The allegations will be reviewed,” a city Law Department spokesman told the Post Monday.