Hugh Keays-Byrne (18 May 1947 – 2 December 2020) was a British-Australian actor and director. A former member of the Royal Shakespeare Company, he is best known for playing the main antagonists in two films of the Mad Max franchise: the Toecutter in Mad Max (1979) and Immortan Joe in Mad Max: Fury Road (2015). He also played the Toad in the biker film Stone (1974) and Grunchlk in the science fiction series Farscape.

Keays-Byrne was born in Srinagar, in the state of Jammu and Kashmir (then part of British India, now India), to British parents; his family returned to Britain when India was partitioned. He began his career as a stage actor.

Keays-Byrne first appeared on television in 1967 in the British television programme Boy Meets Girl. He took part in Peter Brook's production of A Midsummer Night's Dream with the Royal Shakespeare Company, which toured Australia in 1973. After the tour ended, Keays-Byrne decided to stay in Australia. In 1974 he appeared in the television film Essington, and then made his film debut in the motorcycle film Stone (1974). This was followed by supporting roles in films such as The Man from Hong Kong (1975), Mad Dog Morgan (1976), The Trespassers (1976) and Snapshot (1979).

After his first leading role in the 1978 television film Death Train, Keays-Byrne was cast as the vicious gang leader the Toecutter in Mad Max (1979). Director George Miller made Keays-Byrne and the other gang actors travel from Sydney to Melbourne as a group on motorcycles, as there was no money for plane tickets. In the early international version of the film, Keays-Byrne was dubbed with a bad American accent, which Miller later regretted.