Alexander Doig Stewart (January 27, 1926 - August 12, 1999) was bishop of the Episcopal Diocese of Western Massachusetts from 1970 to 1984.

He studied at the Cambridge Rindge and Latin School and worked for some time in the MIT Acoustics Lab for the Naval Ordnance Laboratory.

During his time in Western Massachusetts, he founded numerous parishes and established the new prayer book as the regular form of worship in the diocese.

In 1983, Presiding Bishop John Allin asked him to become Executive for Administration at the Episcopal Church Center, which he accepted.

Stewart retired in 1997 and died on August 12, 1999, in Springfield, Massachusetts, due to complications of pancreatic cancer.