Moydow (Irish: Maigh Dumha) is a barony in County Longford, Ireland.

[1] Moydow barony is located in central County Longford, stretching from the River Shannon to Richmount Hill.

Anciently Moydow barony was part of a territory known as Tethbae.

The barony was formed from the territories of Clanawlye (Ardagh & Moydow), and parts of the territories of Moybrawne (Taghshinny parish), Clanconnor (part Kilcommock, part Cashel parishes) and Muintergalgan.

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