Fethard (Irish: Fiodh Ard) is a town in County Tipperary, Republic of Ireland not far from Cashel, south of the midlands of Ireland. The town is particularly remarkable for having been heavily fortified and completely surrounded by town walls, which can still be seen today. Knockelly Castle, a well fortified tower house is one of many historical buildings in the area.

Fethard (sometimes Fethard-On-Sea) is also the name of a coastal village in County Wexford, Republic of Ireland, on the Hook peninsula.

See also: List of towns in the Republic of Ireland