St. Mullin's Upper (Irish: Tigh Moling Uachtarach) is a barony in County Carlow, Ireland.

[1] The area now called St. Mullin's Upper was formerly an exclave until the two parts were separated in 1841.

Very early this area was referred to as Fearann Uí Néill, or the country of Farren O'Neale, lords of Tully.

This may refer to the Uí Néill sept of Magh Dá Chonn in Leinster.

This article related to the geography of County Carlow, Ireland is a stub.