Donald Douglas (24 August 1905 – 31 December 1945) was a Scottish actor in films and on radio.

Douglas appeared in over 100 films from the late 1920s to the 1940s including The Great Gabbo (1929), Life Begins (1932), Men in White (1934), Madame X (1937), Cheers for Miss Bishop (1941), Now, Voyager (1942), Little Tokyo, U.S.A. (1942), Tall in the Saddle (1944), Murder, My Sweet (1944), Show Business (1944) and Gilda (1946).

Douglas was a one-man cast on The Black Castle. He played all roles in each episode and was the announcer. A review of The Black Castle in the trade publication Billboard complimented Douglas's handling of multiple roles in the drama. Bob Francis wrote: "Except for the fact that he is inclined to ham the wizard, making the role often seem more silly than awesome, Douglas puts on a good 15 minutes. His vocal changes are sharp and clear, and his characterizations come over effectively."

He also had the title role in John Steele, Adventurer and played Chief Jake Workley in Scattergood Baines. He was also a member of the cast of Kelly's Courthouse.

Douglas died on 31 December 1945 in Los Angeles, California, aged 40, after emergency surgery for a ruptured appendix. He is interred in the Forest Lawn Memorial Park Cemetery in Glendale, California.