The Uí Fidgenti, Fidgeinti, Fidgente, or Fidgeinte (/iː ˈfiːjɛnti/ or /ˈfiːjɛntə/; "descendents of, or of the tribe of, Fidgenti") were an early kingdom of northern Munster in Ireland, situated mostly in modern County Limerick, but extending into County Clare and County Tipperary, and possibly even County Kerry and County Cork, at maximum extents, which varied over time. They flourished from about 377 A.D. (assumption of power of Fidgheinte) to 977 (death of Donovan), although they continued to devolve for another three hundred years. They have been given various origins among both the early or proto-Eóganachta and among the Dáirine by different scholars working in a number of traditions, with no agreement ever reached or appearing reachable.
Genealogies deriving from the Ui Fidgheinte include O'Billry, O’Bruadair (Brouder), O'Cennfhaelaidh (Kenneally/Kenealy), Clerkin, Collins (Cuilen), O'Connell, O'Dea, Donovan, Flannery, O'Heffernans, Kenealyes, Mac Eneiry, O'Kealy (Queally), O'Quin, and Tracy.