Mullinalaghta (/ˌmɔːlɪnəˈlæxtə, -lɪnˈjæx-/; Irish Mullach na Leachta), also officially referred to as Mullanalaghta, is a half-parish in the north-eastern part of County Longford, Ireland, located about eight kilometres north of Granard.

The area consists of eleven townlands: Aghanoran (Achadh an Fhuaráin), Cloonagh (Cluain Each), Clooneen (Cluainín), Culleenmore (An Cuilleann Mór), Derrycassan (Doire an Chasáin), Druminacrehir (Droimeann na Criathrach), Kilmore (An Chill Mhór), Larkfield (Cluain Fhuiseog), Leitrim (Liathdhroim), Mullinroe (An Mullán Rua) and Toome (An Tom).

[citation needed] Mullinalaghta's landscape is a combination of rolling drumlins, lakes, and woodland having earned it the description of "the new West Cork" by the journalist Mary Kenny.

A former landlord's demesne at Derrycassan on the shore of Lough Gowna has been planted with both deciduous and coniferous trees by the Irish Forestry Commission, and has been developed by the local community as a tourist attraction with walks and picnic areas.

Gaelic football is the main sport in the area,[citation needed] and Mullinalaghta St Columba's is the local club.