Lindsay Lohan is officially in a biz where she’s got a ton of experience … she’s a part-owner of a nightclub, and her name’s above the door.

LOHAN, the nightclub, is opening this weekend in Athens … and we’re told it’s all thanks to LiLo’s pal, Dennis Papageorgiou. The Greek restaurateur is the owner, but we’re told Lindsay’s getting a big chunk of the profits, aka … back end.

A LOHAN spokesperson tells us Dennis came up with the idea in July — the same month Lindsay and ex-fiance Egor split — and Lindsay was down with it, naturally.

We’re told the decor is “abandoned factory” chic with baroque detailing, whatever that means. Best of all … there’s a standard VIP area, and also a completely secluded VVIP area. That’s not a joke. Think Lindsay meets ‘Night at the Roxbury.’

We’re told she’ll make appearances 2 or 3 times a month. Opa!