| Honorific-Prefix: | The Honourable |
| Sir Walter Crocker | |
| Office: | Administrator of South Australia |
| Term Start: | 30 April 1977 |
| Term End: | 1 September 1977 |
| Predecessor: | Douglas Nicholls |
| Successor: | Keith Seaman |
| Office1: | Lieutenant-Governor of South Australia |
| Term Start1: | 3 September 1973 |
| Term End1: | 27 June 1982 |
| Predecessor1: | Mellis Napier |
| Successor1: | Condor Laucke |
| Birth Name: | Walter Russell Crocker |
| Birth Date: | 25 March 1902 |
| Birth Place: | Broken Hill, New South Wales |
| Death Place: | Henley Beach, South Australia |
| Occupation: | Public servant, diplomat |
| Nationality: | Australian |
Sir Walter Russell Crocker (25 March 190214 November 2002) was an Australian diplomat, writer and war veteran.
Crocker was born in Broken Hill, New South Wales, the eldest son of Robert Crocker and Alma Bray. He served in World War II with the British Army, becoming a lieutenant colonel.
He was ambassador or high commissioner to eleven countries, including India (twice), Indonesia, Canada,[1] Italy, Belgium, Nepal, the Netherlands, Ethiopia, Kenya and Uganda.[2] He headed the Department of International Relations at the Research School of Pacific (and Asian) Studies, Australian National University, 1949–1954.[3]
Crocker was a Lieutenant-Governor of South Australia for more than nine years. He and his wife, Claire, had two sons, Robert and Christopher.[4]
Crocker authored a well-received biography of Jawaharlal Nehru titled (1966).
Crocker was made a Commander of the Order of the British Empire in 1955 while Australian Ambassador to Indonesia. He was later promoted to Knight Commander of the Order of the British Empire (KBE) in 1977, in recognition of his service to the public.