Woman missing off Vic beach

A woman's disappeared while swimming at a Victorian beach it it's feared she may have been caught in a rip.

A search is underway after surf life savers at Mornington raised the alarm shortly after 9.30am.

The woman was last seen floating on her back around 150 metres from shore at Mills Beach.

"Several other people were rescued from a nearby rip this morning and it's feared the woman may also have been caught in the rip," Victoria Police said in a statement on Saturday.

The woman is described as being of caucasian appearance, in her early to mid-40s, with short dark hair.

She was wearing a blue or black one-piece swimsuit.