Rathcline (/ræ(t)ˈkliːn/; Irish: Ráth Claon) is a barony in County Longford, Ireland.

[1] Rathcline is located in southwest County Longford, to the east of Lough Ree and north of the River Inny.

Rathcline Castle (near modern Lanesborough) was built around the 9th Century by the Ó Cuinn (O'Quinn) clan.

Later it was fought for and taken by the Uí Fhearghail (O'Farrell) clan and subsequently taken over by the Normans around the beginning of the 12th Century.

Ó Fachtna (O'Faughny) is also noted as chief of the Callow (Callo) into the 16th century.