Tony Williamson (b. Manchester 18 December 1932, d. 19 June 1991) was a prolific British television writer, most active from the mid-1960s to the mid-1980s. He wrote primarily for the action-adventure and espionage genres. Perhaps because of his early involvement inThe Avengers, he often found work on shows that featured fantasy adventure, rather than the kitchen sink realism that had arisen in Britain at the start of his career. Series with extraordinary lead characters in unusual circumstances, such as Department S, Jason King, Randall and Hopkirk (Deceased) and The Adventurer, dominated his output.
When he returned to Britain, he flirted with soap operas like Coronation Street and Compact. However, by the mid-1960s, he embarked upon his career of writing spy fiction with the sale of a script to The Mask of Janus. Though he also contributed to its spin-off, The Spies, Williamson swiftly moved on to a more fantastic espionage setting with his first sale to The Avengers in 1965. He wrote a few more scripts for the Emma Peel era before being tapped by Sydney Newman to script edit Adam Adamant Lives! When Newman cancelled that show, he returned to The Avengers, for which he was a dominant writer of the show's Peel-less final season.
Following the demise of The Avengers, he worked on a number of programmes on which Dennis Spooner held some measure of creative control as creator or story editor. Projects like Randall and Hopkirk (Deceased), The Champions, and Department S all came to accept his script submissions following Adamant!. His initial sale to Department S was particularly significant in that it began a series of sales involving the character of Jason King, the lead in two programmes in the early 1970s. His final script using the spy, Jason King's "A Page Before Dying", would mark the passage of Williamson's longest association with a single fictional character.