HMS Portisham was one of 93 ships of the Ham-class of inshore minesweepers.

The minesweeper was named after Portesham in Dorset, using an alternative spelling for the village.

On 15 April 1973, Portisham assisted a Royal Dutch Navy Breguet Atlantic aircraft no 257 which ditched off Wassenaar, Netherlands.

She was procured for conversion to a liveaboard ship by an Irish national in 2007 and is currently the second biggest private vessel under the Irish flag.

This article about a specific naval minesweeper of the United Kingdom is a stub.