PITTSBURGH STEELER SANTONIO HOLMES THROWS HIS GLASS AT A WOMAN'S FACE WHEN SHE REFUSED TO MOVE!

More nightclub problems for the Pittsburgh Steelers -- this time one of their best wide receivers is accused of attacking a woman with a glass -- and slicing her face open.

The man at the center of the drama is Santonio Holmes -- former Super Bowl MVP.

According to a new lawsuit filed last week in Florida, Holmes got into a verbal spat with a woman at Rain Nightclub in Orlando on March 7 over a spot on a couch in the VIP section.

According to the docs, the woman says Holmes began going crazy when she refused to move -- so he fired his glass full of liquor at her face ... causing a "laceration" very close to her eye.

Here's where it gets even crazier -- the woman claims she flagged down cops from the Orlando PD -- but they, along with Santonio, "pressured" her not to press charges.

The woman claims Santonio even offered her money because "he was an NFL star and could not get into trouble."

A rep for the Steelers tells us, "We are aware of the situation, and we are still gathering information."