Meryl Streep and Martin Short swear they aren’t dating … but, they’re certainly spending a lot of late nights together — pulling up to “Saturday Night Live” in the same car.

The two stars pulled up to 30 Rockefeller Plaza last night … about 10 minutes before the show was set to kick off.

It’s a short clip … the two jump out of the car together, and Martin exchanges pleasantries with a man who appears to be a security guard.

As you know … Meryl costarred on the third season of “Only Murders in the Building” with Martin, Selena Gomez and Steve Martin — and, sparked dating rumors with Short soon after.

A rep for Short told us last year that the two aren’t dating, and they’re just friends … but, Meryl and Martin are constantly together — recently appearing at multiple ‘SNL50’ events together.

BTW … looks like Meryl and Martin didn’t just hit up ‘SNL’ last night — ’cause Jennifer Lopez posted a pic from behind-the-scenes of the Broadway show “Oh, Mary!” alongside them and a few other famous faces.