Doug Frost (born 11 November 1943 in Orange, New South Wales) is an Australian swimming coach, best known as the coach of Ian Thorpe.
After Thorpe changed coaches, Frost left the Padstow club to start afresh in Southport, Queensland.
In May 2005, he was appointed the head coach of the swimming program at the Australian Institute of Sport.
In 2009 Frost was appointed head of the British Swimming ITC in Stirling, Scotland.
In early 2011 he was released from the role due to continued difficult relations with several of his swimmers.