Robert Hunter MacGimsey (1898–1979) was an American composer and performer, renowned for his contributions to music in the style of African-American spirituals. Born in Pineville, Louisiana, MacGimsey spent his formative years surrounded by African-Americans who lived and worked with his family, profoundly influencing his musical style. This influence led to a common misconception that he was a black composer.

MacGimsey's most famous composition is the Christmas carol "Sweet Little Jesus Boy" (1934). He also composed "Shadrack," which became a hit for Brook Benton in 1962 and was recorded by artists like Louis Armstrong. Another notable work is "How Do You Do?" from the Walt Disney film "Song of the South," which is featured in the Splash Mountain theme park attraction.

Before his musical career, MacGimsey practiced law in Lake Providence, Louisiana, and served as an adviser to U.S. Senator Joseph E. Ransdell. However, he eventually left law to pursue music full-time, becoming a celebrated performer known for his unique skill in double whistling, or whistling duets by himself. He performed internationally and even at the White House for President Lyndon Johnson.

MacGimsey's dedication to preserving African-American spirituals was a significant part of his legacy. His works, letters, and library are preserved in the archives at Louisiana College in Pineville. He passed away in Phoenix, Arizona, in 1979.