Dundalk Lower (Irish: Dún Dealgan Íochtarach) is a barony in County Louth, Ireland.

Dundalk Lower is found in northeast County Louth, making up all of the Cooley Peninsula.

Dundalk Lower was formed from the territory of Fera Lorg, Lorgan, or Lurgin.

In Airgíalla, the MacScannlain are found centered here in the parish of Ballymacscanlan.

The barony of Dundalk was the ancient home of the Conaille Muirtheimhne.