Police are hunting a man who sexually assaulted three women in the CBD.

The attacks happened on February 15.

A Carlton North woman, 23, was waiting for a lift Lingham Lane around 9am when a man struck up a conversation.

He followed her into a nearby business before sexually assaulting her.

He then moved away, approaching another woman on Degraves Street and sexually assaulting her in a corridor.

Police believed he then approached a 39-year-old Essendon woman in Flinders Lane and followed her into Mills Lane where he attempted to sexually assault the woman.

She was able to push the man away and run into a nearby office building to alert staff.

Anyone with any information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential crime report to www.crimestoppersvic.com.au