Grayback

Grayback or Greyback may refer to:


 * Grayback (fish)
 * Dowitcher, a wading bird
 * An American duck, Aythya americana
 * A character in the Battle Realms: Winter of the Wolf video game expansion pack
 * Greyback, an American Civil War Confederate currency
 * USS Grayback, either of two US Navy submarines