The parents of several students from a Melbourne private school are considering suing a prominent St Kilda nightclub for using provocative images of their daughters, some just 16, to promote the venue.

More than 15 girls from St Michael's Grammar in St Kilda were photographed at Superdisco, which is held at the Prince Bandroom every Saturday night.

An image from Superdisco's site.

Up to 50 images of the students appeared on the club's Facebook page over the past month, despite the girls being under 18 and not legally permitted to enter the licensed premises. Several photographs include young women kissing each other or posing provocatively.

Victoria's liquor authorities are investigating the allegations, and several parents are considering legal action against the venue and its promoter after parents were notified by the school of their daughters' involvement.