Greenback(s) may refer to:

Currency

  • Greenback (1860s money), a fiat currency issued during the American Civil War
  • United States Note, paper money issued from 1862 to 1971
  • Greenback, a nickname used for the United States dollar in the financial press in other countries

Fish

  • Greenback cutthroat trout (Oncorhynchus clarki stomias), the easternmost subspecies of cutthroat trout in the US
  • Greenback flounder (Rhombosolea tapirina), a species of flounder found in Australasian waters
  • Greenback horse mackerel (Trachurus declivis), a species of jack found in Australasian waters
  • Greenback stingaree (Urolophus viridis), a stingray found in SE Australian waters

Music

  • "Greenbacks", a 1955 song by Ray Charles
  • "Greenbacks" (Once Upon a Time), an episode of the seventh season of Once Upon a Time

Other uses

  • Baron Silas Greenback, a fictional villainous toad in Danger Mouse (TV series)
  • Greenback, Tennessee, a city in the United States
  • Greenback Party, an American political party active between 1874 and 1884 which advocated non-gold-backed government currency