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Fitzgibbon, FitzGibbon, Fitz-Gibbon and Fitzgibbons are Irish surnames of Anglo-Norman origin. FitzGibbon and its variants have long been widespread and important surnames within Ireland. The surnames were first found in 12th century Ireland, shortly after the Norman invasion of Ireland, in which two distinct families were established in Limerick and Mayo.

The surname means "Son of Gibbon", with "Gibbon" being derived from "Gibb", a short form of the popular Norman personal name Gilbert, which was first introduced in the 11th century by followers of William the Conqueror after the Norman Conquest of England. Gilbert was originally derived from the name Gislebert or Gillebert, which is composed of the Germanic elements Gisil which means "hostage", "pledge", or "noble youth," and berht, which means "bright" or "famous."

In Limerick, the noble FitzGerald dynasty established a knighthood under the FitzGibbon family branch. Known as The White Knight, the family held territory in southeast Limerick, near County Cork. The knighthood was descended from John FitzThomas, 1st Baron Desmond, ancestor of The Earls of Desmond and grandson of the Norman baron Maurice FitzGerald, Lord of Llanstephan. The other two branches of the FitzGerald family were known as the Green Knight and the Black Knight, both of which kept the FitzGerald name. in Mayo, those with the surname FitzGibbon (and its variants, such as Gibbon and Gibbons) were originally a branch of the great Burke family, known as MacGibbon Burke, with Anglo-Norman (and later Hiberno-Norman) roots.

Notable people with the name include: