Donald Wilbur Stewart (born February 8, 1940) is a former American lawyer who was a United States Senator from Alabama from 1978 to 1981.

Mrs. Allen had called Stewart "a flaming liberal", and her brother, James Pittman, thereafter formed the group "Conservative Democrats for Martin."

[3] In his first year as a U.S. senator, he compiled a near-perfect attendance record, introduced twelve bills and was co-sponsor of eighty others.

[2] Stewart failed to gain reelection to the Senate in 1980, losing the Democratic primary to state Public Service Commissioner Jim Folsom, Jr. Folsom went on to lose narrowly to Republican Jeremiah Denton in the general election.

He was lead attorney on a class action lawsuit against agricultural biotech giant Monsanto Company for PCB dumping in his hometown of Anniston.