Grey Mare or Gray Mare may refer to:
Grey Mare's Tail (disambiguation), the name of several waterfalls The Grey Mare and her Colts, a megalithic chambered long barrow in Dorset, England "The Old Gray Mare", an American folk song Old Grey Mare, York, a pub in North Yorkshire, England Greymare, Queensland, a rural locality in the Southern Downs Region, Queensland, Australia Lady Suffolk (1833–1855), an American trotting horse, also known as "Old Gray Mare"