Forth (Irish: Fotharta) (Yola: Forthe, or Vorth) is a barony in County Wexford in Ireland.
Forth is bordered by Wexford Harbour to the north, St George's Channel to the east, the Celtic Sea to the south, and the baronies of Bargy to the west and Shelmaliere East to the northwest. Settlements in the barony include Wexford, Rosslare, Kilrane, Broadway, Ballycogly, Killinick, and Tagoat. Other features include Lady's Island Lake and Carnsore Point.