Tarn may refer to:
Places Tarn (lake), a mountain lake or pool formed in a cirque excavated by a glacier
England The Tarn, a park, nature reserve, and lake in Mottingham, Royal Borough of Greenwich. Tarn or Barnsley, South Yorkshire, England Tarn Crag (disambiguation), a number of hills in the English Lake District Tarns, Cumbria Tarn Wadling, a former lake near High Hesket in Cumbria
France Tarn (department), a department in southwest France Lisle-sur-Tarn, France, a commune in the Tarn department Marssac-sur-Tarn, France, a commune in the Tarn département Tarn (river), a river in France Gorges du Tarn, France, a canyon along the course of the Tarn River Tarn-et-Garonne, a department in southwest France
United States Tarn Oil Field, an oil field in Alaska, U.S.
Chile Mount Tarn, a summit on the southern part of the Strait of Magellan, Chile
Outer space 13032 Tarn, a main-belt minor planet
People Aleks Tarn (born 1955), journalist and author Gary Tarn (born 1962), British filmmaker and composer Maria Dyer (née Tarn, 1803–1846), British Protestant Christian missionary to the Chinese Michael Tarn (born 1953), British film and television actor Nathaniel Tarn (born 1928), British-American poet Tarn Adams (born 1978), American co-creator of the video game Dwarf Fortress Tarn Mann, Indian writer, producer and director William Woodthorpe Tarn (1869–1957), 20th century British historian and author
Transportation HMS Tarn (P336), a Second World War British T class submarine Tarn Light Railway
Fiction Tarn, a type of large bird ridden by characters in the Gor fiction series by John Norman Tarn, a Decepticon in the Transformers franchise Tarn the Uncaring, a character in Marvel Comics
See also Tarn Taran (disambiguation), various places Tarne, a spider genus of the family Salticidae (jumping spiders)