Simon Callow was born 15 June 1949 in Streatham, London, the son of Yvonne Mary, a secretary, and Neil Francis Callow, a businessman. His father was of English and French descent and his mother was of Danish and German ancestry. He was raised as a Roman Catholic. Callow was educated at the London Oratory School and then went on to study at Queen's University Belfast in Northern Ireland where he was active in the Northern Ireland civil rights movement, before giving up his degree course to go into acting at the Drama Centre London.

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