Location: Princetown, Devon, England
Notable Residents: Thomas Jones, Baron Maelor, Peter Hammond
Amenities: Full and part-time education programs available

Owned by the Duchy of Cornwall and operated by Her Majesty's Prison Service, HM Prison Dartmoor is a Category C prison in Princeton, Devon. It was built during the early 19th century and was used to hold prisoners from the Napoleonic Wars and the War of 1812. Over 6,000 American sailors were imprisoned at HM Prison Dartmoor from 1813 to 1815. During their incarceration, they created their own society, complete with a market, theater, and gambling room. In the spring of 1815, seven were killed during an escape attempt; a memorial was built to commemorate the prisoners of war who stayed at Dartmoor.

In 1932, there was a riot at the prison after inmates were sent back to their cells for ignoring commands. When they refused to enter their cells, prison staff fled to a secure sector of the prison, while inmates freed those held in solitary confinement. No staff were injured, but one prisoner was shot. In 2001, the prison was condemned due to sanitation issues, and it became a Category C prison for less violent offenders a year later.

Today, the prison offers full and part-time education, as well as several vocational programs for electronics, brick work, carpentry, and more. Each year, the prison hosts the "Dartmoor Jail Break" charity event, where civilians attempt to escape from the prison over a four-day period.