Moanin' Low is a popular torch song. The music was written by Ralph Rainger; the lyrics by Howard Dietz. The song was published in 1929 and was introduced that same year in the musical revue The Little Show by Libby Holman becoming a hit and Holman's signature song. Since its publication, the song has become a popular jazz standard.

Billie Holiday recorded her version of the song in 1937.

In the movie Key LargoClaire Trevor gave a memorable rendition of the song in a role that won her the 1948 Academy Award for Best Supporting Actress.

Annette Hanshaw's 1929 version was used in the animated film Sita Sings the Blues.