Beauharnois

Beauharnois may refer to:
 * An alternative spelling of French House of Beauharnais

Members of the House of Beauharnais

 * Charles de la Boische, Marquis de Beauharnois (1670–1749), Governor General of North-American New France (fr: Nouvelle-France); places carrying his name, including: Beauharnois, Quebec and Fort Beauharnois, Minnesota
 * Claude de Beauharnois de Beaumont et de Villechauve (1674–1738), French naval officer
 * François de Beauharnois de la Chaussaye, Baron de Beauville (1660s–1746), French naval and colonial administrator in France and in New France (Nouvelle-France)

Places

 * Beauharnois (federal electoral district)
 * Beauharnois (Province of Canada electoral district)
 * Beauharnois (provincial electoral district)
 * Beauharnois, Quebec
 * Beauharnois Canal
 * Fort Beauharnois
 * Beauharnois—Laprairie
 * Beauharnois—Salaberry
 * Beauharnois-Salaberry Regional County Municipality, Quebec

Other

 * Battle of Beauharnois
 * Beauharnois scandal
 * HMCS Beauharnois (K540) - Canadian Flower-class corvette
 * BHS, an OVH datacenter in the city of Beauharnois, south of Montreal, Canada
 * Beauharnois Hydroelectric Power Station

United States

 * Fort Beauharnois, Minnesota