Chalmette is a census-designated place (CDP) in and the parish seat of St. Bernard Parish, Louisiana, United States. The population was 32,069 at the 2000 census. It is part of the New Orleans–Metairie–Kenner Metropolitan Statistical Area. Chalmette is located east of downtown New Orleans and south of Arabi, Louisiana, towards Lake Borgne.
The community was named after plantation owner I. Martin de Lino de Chalmette, whose surname is, in turn, derived from the French word chalmette— "pasture land, fallow land" (used especially in a mountainous area) — and has been traced to the Proto-Celtic *kalm.
Chalmette was the location of what is often called The Battle of New Orleans, where United States forces under Major General Andrew Jackson defeated the British, led by brevet Lieutenant General Sir Edward Pakenham in January, 1815. The battlefield is preserved as a national monument, and the military Chalmette National Cemetery is adjacent.