Alexander Douglas Dyas (January 21, 1886 – February 22, 1958) was a physician and political figure in New Brunswick, Canada.
He represented Charlotte County in the Legislative Assembly of New Brunswick from 1935 to 1944 as a Liberal member.
He was born in Parrsboro, Nova Scotia, the son of Alexander H. Dyas and Cecilia Hazel.
Dyas served as a captain in a field ambulance unit during World War I.
This article about a member of the Legislative Assembly of New Brunswick is a stub.