Sir Walter Jackson Cooper, MBE (23 April 1888 – 22 July 1973) was an Australian politician who served as a Senator for Queensland for over 36 years. He served in the Senate from 1928 to 1932 and 1935 to 1968, representing the Country Party. He was also Minister for Repatriation in the Menzies Government from 1949 to 1960.