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