Louth may refer to:
Australia
Hundred of Louth, a cadastral unit in South Australia
Louth, New South Wales, a town
Louth Bay, a bay in South Australia
Louth Bay, South Australia, a town and locality
Canada
Louth, Ontario
Ireland
County Louth, Ireland
Louth GAA, a Gaelic games association
Louth county football team
Louth, County Louth, a village in the heart of the county Louth
County Louth Historic Names, Listing of historically documented names for Louth, village & county County Louth (Parliament of Ireland constituency) (1692–1801) County Louth (UK Parliament constituency) (1801–1885, 1918–1922), Ireland North Louth (UK Parliament constituency) (1885–1918) South Louth (UK Parliament constituency) (1885–1918) Louth (Dáil constituency), Ireland