Otto Abels Harbach (August 18, 1873 - January 24, 1963) was a lyricist and librettist of about 50 musical comedies. He was born in Salt Lake City, Utah and became an English teacher and then a newspaper reporter. Harbach passed away in New York City.

These include:

• Early Work
  • 1907 Three Twins (music Karl Hoschna )
  • 1909 Bright Eyes (music Karl Hoschna )
  • 1912 The Firefly (music Rudolf Friml)

• Jerome Kern and Harbach
  • 1931 The Cat and The Fiddle
  • 1933 Roberta

• Oscar Hammerstein II and Harbach
  • 1924 Rose-Marie by Rudolf Friml
  • 1926 The Desert Song by Sigmund Romberg