Police are searching for a group of men they believe harassed and assaulted St Kilda Festival-goers earlier this month, leaving one man in hospital with serious head injuries.

The injured New Zealand man, 23, had been walking with a male friend along Jacka Boulevard at 10pm on February 10, when he was approached by three men. One of the men hit him several times in the face.

The attackers then left in a northerly direction along Jacka Boulevard and were chased by witnesses who lost sight of them and called police.

The victim was admitted to The Alfred hospital with serious head injuries, and is now in a stable condition.

One man is due to face the Melbourne Magistrates Court on Tuesday charged with intentionally and recklessly causing serious with causing injury.

Police now say several other people at the festival that night had reported altercations with a group they believe may have been the same men.

Police believe the group was seen acting aggressively towards a woman on the beach near St Kilda Pier and towards a man wearing a poncho on Jacka Boulevard.

Detectives from St Kilda Crime Investigation Unit are investigating and want to hear from anyone who may have seen or had dealings with the group.

Anyone with any information is urged to contact Crime Stoppers on 1800 333 000 or www.crimestoppers.com.au.