James Howard Dunn (November 2, 1905 – September 3, 1967) was an American film actor.

Born in New York, New York, Dunn started his entertainment career in vaudeville before progressing to films in the early 1930s. He made a strong first impression with his early roles, Bad Girl (1931), and three Shirley Temple films, Baby Take a Bow , Stand Up and Cheer and Bright Eyes (all 1934).

The roles that followed did nothing to further his career, and during the late 1930s his prospects were further diminished by a battle with alcoholism. In 1945 his performance in A Tree Grows in Brooklyn earned him an Academy Award for Best Supporting Actor. His success was shortlived and by the beginning of the 1950s, he was unemployed, bankrupt and once again depending on alcohol. He appeared in the sitcom It's A Great Life from 1954 until 1956.

He was married to the actress Frances Gifford from 1938 until 1942.

He died as a result of complications following stomach surgery in Santa Monica, California.

James Dunn has two stars on the Hollywood Walk of Fame for his contributions to motion pictures at 6555 Hollywood Boulevard, and television at 7000 Hollywood Boulevard.