Hoag is a surname that refers to:
- Arthur Allen Hoag (1921–1999), American astronomer
- Bob Hoag (contemporary), American record producer and songwriter
- Charles Hoag (1808–1888), American scholar and teacher; first school master of Minneapolis, Minnesota
- Charlie Hoag (1931-2012), American professional basketball player
- Dutch Hoag (contemporary), American race car driver
- Elizabeth Gorham Hoag (1857–1875), American sorority sister; founding member of Sigma Kappa
- Harold Hoag (b. 1966), American professional wrestler
- Jan Hoag (b. 1948), American film and television actress
- Judith Hoag (b. 1968), American actress
- Myril Hoag (1908–1971), American professional baseball player
- Ryan Hoag (b. 1979), American professional football player
- Tami Hoag (b. 1959), American author of romance novels
- Truman H. Hoag (1816–1870), American politician from Ohio; U.S. representative 1869–70