The 5th Battalion, Devonshire Regiment, was a part-time unit of the British Army recruited in the county of Devon. It was formed in the Territorial Force in 1908 by amalgamating two existing Volunteer Battalions of the Devonshire Regiment. The battalion served in India and fought in Palestine and on the Western Front during World War I. In World War II it provided two anti-tank artillery units, which served in Tunisia, Italy and North West Europe. They were both merged into other Devonshire units in 1950.

William Henry Edgcumbe, 4th Earl of Mount Edgcumbe, GCVO, PC, DL, styled Viscount Valletort between 1839 and 1861, was a British courtier, Conservative politician, and Volunteer officer.