Robert Chisholm Rankin was an Australian politician.
In 1940 he was elected to the Victorian Legislative Council for Western Province, representing the Country Party. He left the Country Party in 1947 and in 1948 joined the Liberal Party. He was defeated in 1952.
Rankin died in Toorak in 1955.
Returning from the war, he farmed at Harrow and then at Horsham. He was a life member of the Returned and Services League.