Tír Amhlaidh was a túath in northwest Ireland.
It is now represented by the barony of Tirawley, County Mayo.
The name is derived from Amhalghaidh, son of Fíachra son of Eochaid Mugmedon of the Connachta group of early Gaelic dynasties.
Several military families of Welsh extraction and associated with the Norman invasion settled in this region and intermarried with the local clans, namely Walshes, Joyces, Lawlesses, Lynotts, and Barretts.
The túath contained many castles as part of its defence network.