Cyril Everett Isaac OBE (14 October 1884 – 17 September 1965) was an Australian politician.
He was born in Brunswick to Congregationalist minister Abraham Isaac and Mary Judd.
In 1940 he was elected to the Victorian Legislative Council as a United Australia Party member for South Eastern Province.
While in the Council he ran a Save the Forests campaign, which evolved into the National Resources Conservation League in which Isaac played a leading role.
He lost Liberal and Country Party endorsement in 1952 and was defeated running as an independent candidate.