Thomas Nicol Williamson (14 September 1936 – 16 December 2011) was a British actor. He was once described by playwright John Osborne as "the greatest actor since Marlon Brando". He was also described by Samuel Beckett as "touched by genius" and viewed by many critics as "the Hamlet of his generation" during the late 1960s.

Early life
Thomas Nicol Williamson was born on 14 September 1936 (he would later claim 1938 in Who's Who) in Hamilton, Lanarkshire, the son of Hugh Williamson, operator of an aluminium manufacturing plant and former hairdresser's assistant, and Mary Brown Hill, née Storrie. When he was 18 months old, his family moved to Birmingham, England. Williamson was sent back to Hamilton to live with his grandparents during World War II due to Birmingham's susceptibility to bombing, but returned when the war ended, and was educated at the Central Grammar School for Boys, Birmingham. He left school at 16 to begin work in his father's factory and later attended the Birmingham School of Speech & Drama. He recalled his time there as "a disaster" and claimed "it was nothing more than a finishing school for the daughters of local businessmen".