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 (1885–1918)
  • South Louth (1885–1918)
  • Louth (Dáil constituency), Ireland (since 1923)

United Kingdom

  • Louth, Lincolnshire, England
  • Louth, Lincolnshire (UK Parliament constituency) (1885–1983), in England

Other

  • Louth (crater), a crater on Mars