John Owen "Jack" Critchley (18 April 1892 – 27 April 1964) was an Australian politician. Born in Callington, South Australia, he was educated at state schools before becoming a railway and vehicle worker. After serving in the military 1914-1918, he was a member of Peterborough Council. In 1930, he was elected to the South Australian House of Assembly as the Labor member for Burra Burra, serving until 1933. In 1946, he was elected to the Australian Senate as a Labor Senator for South Australia. He held the seat until his retirement in 1958. Critchley died in 1964.[1]