Robert Delvey Wetmore, Sr. (July 24, 1930 – January 15, 2016) was an American politician from Massachusetts.

[1] Born to Elmer Marshall and Marion Ray Parmenter, Wetmore was a graduate of Gardner High School.

Wetmore is known for his legislation work to preserve the Quabbin Reservoir and Ware River, as well as advocacy for Article 97 of the Constitution of Massachusetts.

[4] In 2004, the Mount Wachusett Community College dedicated a new building as the Robert D. Wetmore Center for Innovation in Design, Technology and Resource Development.

[5] Prior to his death, caused by Parkinson's disease, in 2016, Wetmore lived on Hubbardston Road in Barre, Massachusetts.