Harry O. Hoyt (6 August 1885 – 29 July 1961) was an American screenwriter and film director whose film career began in 1912, during the silent era. He graduated with a degree in literature from Yale University in 1910. 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. His brother, actor Arthur Hoyt, also appeared in The Lost World.

In November 1912, he married the former Florence Stark in Norwich, Connecticut. Together they had a son, Devereux Gerrard Hoyt, and daughter Daryl Hoyt.

Partial filmography

• The Child of Destiny (1916)
• The Moth (1917)
• The Rough Neck (1919)
• Daredevil Jack (1920)
• The Rider of the King Log (1921)
• Pardon My French (1921)
• The Woman on the Jury (1924)
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