A patron was stabbed with a steak knife in a high roller room at Crown Casino on Saturday night, while more than 20 men were involved in a wild brawl after being refused entry to a bar at the Southbank gaming venue.

A dispute at a restaurant in Crown's Mahogany Room turned violent about 11pm on Saturday, when plates and glasses were hurled by a group of diners before a man was stabbed.

Crown Casino security staff erect a screen around the stabbing victim.

Photographs and video obtained by The Age show Crown security staff immediately partitioned off the area, as patrons continued to gamble just metres away in the exclusive gaming area.