Louth is the name of several locations around the world:
- County Louth, Ireland
- Louth, County Louth, a village in the heart of the 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 Éireann constituency), Ireland
- Louth, Lincolnshire, England
- Louth, Lincolnshire (UK Parliament constituency) (1885–1983), in England
- Louth, New South Wales, Australia
- Louth, Ontario, Canada