Gilbert Moncreiff (died 1598) was a Scottish court physician. In November 1575, Moncreiff joined the court of James VI as "medicinar and houshald man". He would live for four years at Stirling Castle in attendance on the young king. A pension awarded in October 1580 mentioned that he had served the king since his birth in 1566. James Melville visited the king at Stirling with his uncle Andrew Melville in 1575. They also met Moncreiff, who was an old friend of Andrew Melville from their days in Geneva. He died in Edinburgh on 24 February 1597/8.