Donald Bruce Stewart (November 14, 1935 – January 9, 2006) was an American actor best known for his long-running role as attorney Mike Bauer on Guiding Light.

Stewart studied opera in New York City and landed a job as an understudy to Robert Goulet in the Broadway production of Camelot.

After landing the role of Mike Bauer on Guiding Light, Stewart continued to perform in musical theater and nightclubs, including the 1964 production of Babes in the Wood.

Prior to Guiding Light, he appeared on numerous episodes of the 1960s television series Dragnet.

After leaving Guiding Light, Stewart relocated to California, where he made guest appearances in a number of television series, including L.A. Law, Highway to Heaven, Beverly Hills: 90210, and Knots Landing.