John Alexander (November 29, 1897 – July 13, 1982) was an American stage, film, and television actor.

[citation needed] He had a career spanning more than 55 years on Broadway with his first role as the title character in Elmer Brown, the Only Boy in Town in 1908/1909.

[2] He is best remembered for his performance as Teddy Brewster, a lunatic who thinks he is Theodore Roosevelt, in the 1944 classic film Arsenic and Old Lace opposite Cary Grant.

Among his other notable film roles, Alexander played Steve Edwards in A Tree Grows in Brooklyn in 1945, Mr. McComber in Summer Holiday in 1948, Jack Riker in Winchester '73 in 1950 and Howard Shipley in The Marrying Kind in 1952.

During the 1950s and early 1960, he guest starred on television series, such as The Phil Silvers Show, Adventures of the Sea Hawk and Car 54, Where Are You?