Nashua may refer to:

• Nashaway people, Native American tribe living in 17th-century New England

• Nashua, New South Wales, a town

• Nashua, Iowa, a city
• Nashua, Minnesota, a city
• Nashua, Kansas City, a neighborhood of Kansas City, Missouri
• Nashua, Montana, a town
• Nashua, New Hampshire, a city, and the largest city with this name
  • The Nashua River in New Hampshire and Massachusetts

• The Nashua Corporation, American company based in Nashua, New Hampshire
• Nashua (horse), Thoroughbred racehorse and 1955 Horse of the Year
• Nashua Dolphins, South African cricket team
• Nashua (YTB-774), United States Navy harbor tug

• Nashua High School (disambiguation)
• Nasua
• Nassau (disambiguation)