Konni Zilliacus (13 September 1894 – 6 July 1967) was the Member of Parliament for Gateshead from 1945 until 1950, and for Manchester Gorton from 1955 until his death. He was a left-wing Labour Party politician. Zilliacus campaigned for less spending on weapons. He was a founder member of the Campaign for Nuclear Disarmament and opposed the Vietnam War. His father was Konrad Viktor Zilliacus, a Finnish independence activist.