Donald Cecil Porter (September 24, 1912 – February 11, 1997) was an American stage, film, and television actor.

[6] He appeared in various films in the 1940s before landing the role of Peter Sands, the boss of Susan Camille MacNamara (Ann Sothern), on the 1950s sitcom Private Secretary.

[3] He later guest-starred on episodes of Green Acres; Love, American Style; The Mod Squad; Barnaby Jones; The Six Million Dollar Man; Hawaii Five-O; Three's Company (on which he played Jack Tripper's uncle); and Switch.

Porter also had a lucrative stage career that included the long-running hit Any Wednesday (1964) opposite Sandy Dennis and Gene Hackman.

Porter also appeared in numerous films, including The Turning Point (1952), Our Miss Brooks (1956), Gidget Goes to Rome (playing Russell Lawrence two years prior to repeating the role in the series), and Live a Little, Love a Little (1968) starring with Elvis Presley.