William Duff Forrest (June 2, 1874 – September 12, 1939) was a physician and political figure in Nova Scotia, Canada.
He represented Halifax Centre in the Nova Scotia House of Assembly from 1937 to 1939 as a Liberal member.
He was born in Halifax, the son of the Reverend John Forrest and Annie Prescott Duff.
Forrest was educated at Dalhousie University and continued his studies in medicine in London and Edinburgh.
This article about a Liberal party Member of the Nova Scotia House of Assembly is a stub.