Henry Philmore "Harry" Langdon (June 15, 1884 – December 22, 1944) was an American actor and comedian who appeared in vaudeville, silent films (where he had his greatest fame), and talkies.

After his initial success, Langdon fired Capra and directed his own films, including Three's a Crowd, The Chaser, and Heart Trouble, but his appeal faded.

Capra later claimed that Langdon's decline stemmed from the fact that, unlike the other great silent comics, he never fully understood what made his own film character successful.

History shows that Langdon's greatest success was while being directed by Capra, and once he took hold of his own destiny, his original film comedy persona dropped sharply in popularity with audiences.

The coming of sound, and the drastic changes in cinema it engendered, also thwarted Langdon's chances of evolving as a director and perhaps defining a style that might have enjoyed greater box office success.

Langdon's babyish character did not adapt well to sound films; as producer Hal Roach remarked, "He was not so funny articulate."

Langdon was considered to be the live-action role model for Dopey in Snow White and the Seven Dwarfs, but Walt Disney rejected the idea.

Misbehaving Husbands turned out to be Langdon's last starring feature; he shared two subsequent leads with co-star Charley Rogers.

Toward the end of the Columbia series, producer Jules White tried making Langdon part of a team, and paired him with Elsie Ames, Monty Collins, Una Merkel, and finally El Brendel.

In his obituary the New York Times wrote that "his whole appeal was a consummate ability to look inexpressibly forlorn when confronted with manifold misfortunes—usually of the domestic type.

Langdon is briefly depicted in the biographical film Stan & Ollie, played by Richard Cant, where he is preparing for the shooting of Zenobia with Oliver Hardy.

But more important, when success was achieved Langdon dismissed his collaborators and foolishly attempted to run both the creative and financial sides of his operation himself.