Alex Frew (24 October 1877 – 29 April 1947) was an international rugby union forward who played for both Scotland and South Africa.
He played for Kilmarnock RFC before moving to Edinburgh University.
He was capped by Scotland while at Edinburgh University RFC. He graduated as a doctor.
In South Africa, he played for Diggers RFC. He came to South Africa to work in a British-run concentration camp as a doctor.
He was capped for the South-West District before being capped for Glasgow District to play in the 1899 Inter-city match against Edinburgh District.
While at Kilmarnock, he was also capped for West Counties District.
When he moved to South Africa he played for Transvaal province.
Frew played three tests for Scotland and one test for South Africa, captaining them on that one occasion