Faugh-a-Ballagh (foaled 1841 in Ireland) was a Thoroughbred racehorse. A brother to Birdcatcher, Faugh-a-Ballagh was sold to E. J. Erwin in 1842. He ran once as a two-year-old at the Doncaster's Champagne Stakes, finishing third to The Cure and Sorella. He then began his three-year-old season as the first Irish-bred horse to win the St. Leger Stakes, then beat Corona in a match race. He won the Grand Duke Michael Stakes, then the Cesarewitch, and came second to Evenus at the Cambridgeshire. As a four-year-old, he finished second to The Emperor in the Emperor of Russia's Plate.

In 1855, Faugh-a-Ballagh was exported to France. There he sired Fille de l'air, The Oaks and French Oaks winner. He also sired the great stallion Leamington, that sired the American racehorse and leading sire Longfellow, as well as Iroquois, the first American-bred horse to win The Derby.

* Faugh-a-Ballagh is inbred 4D x 4D to the stallion Bagot, meaning that he appears fourth generation twice on the dam side of his pedigree.

* Faugh-a-Ballagh is inbred 5S x 4D to the stallion Woodpecker, meaning that he appears fifth generation (via Catherine) on the sire side of his pedigree, and fourth generation on the dam side of his pedigree.