Henry Cassidy Midgley, PC (NI), known as Harry Midgley (1893 – 29 April 1957) was a prominent trade-unionist and politician in Northern Ireland. Born to a working-class Protestant family in Tiger's Bay, north Belfast, he followed his father into the shipyard. After serving on the Western Front in the Great War, he became an official in a textile workers union and a leading light in the Belfast Labour Party (BLP). He represented the party's efforts in the early 1920s to provide a left opposition to the Unionist government of the new Northern Ireland while remaining non-committal on the divisive question of Irish partition.