Ronnie Ortiz-Magra kisses a woman in a Chicago nightclub

Ronnie Ortiz-Magra single and very ready to socialize … because he’s back on the night club scene, making out with women … and it’s all on video.

The “Jersey Shore” star looked in his element Friday night at the Chicago River North Tunnel as he locked lips with the blonde.

People who were there say that Ronnie entered the club with a friend, and the woman he kissed was already in the room when the reality star appeared … the flirtatious duo did not get together.

Ronnie seemed to be a big hit at the club, and not just with the ladies…he also took a bunch of photos with fans.

We’re told Ronnie didn’t get too rowdy or anything, and he wasn’t seen drinking alcohol.

Remember Ronnie told us last year that he sober … and he’s only months away from calling off his engagement to Safire Matos.