Leitir Mhic an Bhaird or Leitir Mhic a' Bhaird (anglicised as Lettermacaward) is a Gaeltacht village in the Rosses region of County Donegal, Ireland. The village, known colloquially as Leitir (pronounced letcher), is between the larger towns of Glenties and Dungloe. It is also a civil parish in the historic barony of Boylagh.

There are approximately 650 people living in the Leitir Mhic an Bhaird ED and 19% Irish speakers.

The village has two shops, 'Clerkin's', a family run service station, and 'Gallagher's Stop & Shop'. There are 3 pubs; Elliott's, the Gweebarra Bar, and Packie's Bar.

The local Gaelic games club is Na Rossa.

The civil parish contains the village of Lettermacaward.

The civil parish contains the following townlands:

• List of populated places in Ireland

• Further information on the area
• Irish language study 2006