Peter Dyneley (13 April 192119 August 1977) was an English-Canadian actor. Although he appeared in many smaller roles in both film and television, he is best remembered for supplying the voice of Jeff Tracy for the 1960s "Supermarionation" TV series Thunderbirds and its two film sequels, Thunderbirds Are Go (1966) and Thunderbird 6 (1968), all produced by Gerry Anderson. Uncredited, Dyneley also provided the voice of the countdown that introduces the Thunderbirds title sequence.