Harry O. Hoyt (August 6, 1885 – July 29, 1961) was an American screenwriter and film director whose film career began in 1912, during the silent era.

[1] He graduated with a degree in literature from Yale University in 1910.

[2] His 1925 film The Lost World, based on the book by Arthur Conan Doyle, is notable as a pioneering effort in the use of stop-motion animation.

[3] His brother, actor Arthur Hoyt, also appeared in The Lost World.

In November 1912, he married the former Florence Stark in Norwich, Connecticut.