A perverted ex-police sergeant was convicted Tuesday of tossing semen on a coworker’s leg at NYPD headquarters.

“Guilty,” the foreperson said in Manhattan Supreme Court as defendant Michael Iscenko’s wife burst into tears in the gallery.

Iscenko, 56, was found guilty of one count of third-degree sex abuse for the bizarre Jan. 23, 2015, attack. He was already fired because of the incident.

He faces up to three months in jail when Justice Mellissa Jackson sentences him next month. The glum-looking former cop declined comment as he left court flanked by his dejected wife.

His victim, an NYPD administrative aide who had the glob of white gunk lobbed at her, testified last week at the trial.

“I felt something cold and wet behind my leg,” she said. “I turned to look and saw a creamy substance.”

The 63-year-old woman said she looked over her shoulder and saw her co-worker, Iscenko.

“I saw Mike behind me and told him, ‘Ewww! Why did you do that?’ in disgust, and he just looked at me and walked to his office,” the victim said.

She won $147,250 in a suit against the city.

Surveillance video played in court shows Iscenko crouching behind the victim near the elevator banks, flinging the substance on her, then scurrying off.

Iscenko’s lawyer, Michael Horn, who did not present any witnesses and told jurors that the substance was saliva and not semen.

Assistant District Attorney Emily Ching insisted that lab tests prove “there is no other substance this can be other than seminal fluid.”