HM Prison The Weare was a prison ship berthed in Portland Harbour in Dorset, England.
The UK established The Weare in 1997 as a temporary measure to ease prison overcrowding. Weare was docked at the disused Royal Navy dockyard at the Isle of Portland. On 9 March 2005, it was announced that The Weare was to close mainly due to costly running and being unnecessary.
Among the options about what to do with the ship were moving it to London or sinking it in Portland Harbour or around the Isle of Portland as a man-made reef and as a diving location.
Inmates of HMP Weare included Dan Treacy, of the UK new-wave band Television Personalities, who was incarcerated from 1998 to June 2004 for a drug-related offence.