Otto Harbach (1873-1963) was an American lyricist and librettist. He worked largely on musical comedies, and was the lyricist for many songs now in standard repertoire.
The Harbach songs performed by the Muppets include:
- "I Won't Dance" from the film version of Roberta, originally from Three Sisters (music by Jerome Kern, lyrics with Oscar Hammerstein II, Dorothy Fields and Jimmy McHugh)
- "Smoke Gets in Your Eyes" from the stage version of Roberta (music by Jerome Kern)
- "Who?" from Sunny (music by Jerome Kern, lyrics with Oscar Hammerstein II)