Thomas Kingston Critchley, AO, CBE (27 January 1916 – 14 July 2009) was an Australian public servant, diplomat, author and journalist.^{[1][2][3][4][5]}

Critchley was born in Melbourne but grew up at Longueville in Sydney and attended North Sydney Boys High School.^[6] He joined the Rural Bank after completing high school and attended the University of Sydney by night to study economics.

After the Second World War, Critchley joined the Department of External Affairs as the head of the economic relations section.^[6] His first diplomatic role with the department was assisting Australia's representation of Indonesia against the Dutch during the Indonesian National Revolution. He was on the United Nations Commission for Indonesia between 1947 and 1950 and played a role securing Indonesia's independence from the Dutch.^[7]

Critchley served as Australian High Commissioner to Malaysia (1955–1965); Ambassador to Thailand (1969–1973); High Commissioner to Papua New Guinea (1974–1978); and Ambassador to Indonesia (1978–1981).

Critchley's first marriage, to an English Foreign Office employee posted to New Delhi, Joyce Gwendolyn Hew, took place on 9 January 1946 in Delhi. The marriage was witnessed by High Commissioner to India Colin Moodie. Mrs Joyce Critchley followed her husband to Australia in May 1946. Critchley and Hew divorced in 1954.

Critchley, a keen surfer, golfer and tennis player, who also played piano, died on 14 July 2009, survived by his wife Susan and their four daughters.^[6]

Critchley's daughter, Laurie Critchley, is a television producer.^[8]