William John Blease, Baron Blease JP (28 May 1914 – 16 May 2008) was a British politician.
Blease, the son of William John Blease and Sarah Watts, was educated at McClure Public Elementary School and Belfast Technical College, the National Council of Labour Colleges and then the Workers' Educational Association.
Blease worked first as a shop apprentice from 1929, becoming a grocer's assistant and grocery branch manager between 1938 and 1940. In 1940, he moved to Belfast shipyard, where he stayed as clerk until 1945. He then became branch manager of the Co-op Society of Belfast until 1959. In 1976, he was appointed as a justice of the peace for Belfast. He was also a member of the British Institute of Management.
An active trade unionist, Blease was elected to the Northern Ireland Committee of the Irish Congress of Trade Unions in 1959, remaining a member until 1975. That year, he joined the Independent Broadcasting Authority, a post he held for four years.
Blease also joined the Northern Ireland Labour Party. He stood unsuccessfully for the Parliament of Northern Ireland in Belfast Oldpark at the 1953 general election, and in 1965 his son William Victor Blease (usually known as Victor) was unsuccessful in Belfast St Anne's.