Haiphong (Vietnamese: Hải Phòng, IPA: [ha᷉ːj fâwŋ͡m] (listen)), or Hai Phong, is a major industrial city and the third-largest in Vietnam. Hai Phong is also the center of technology, economy, culture, medicine, education, science and trade in the Red River delta.

Haiphong was founded in 1887 as a seaport city by colonists during French colonial rule. In 1888, the president of the French Third Republic, Sadi Carnot, promulgated a decree to establish Haiphong. From 1954 to 1975, Haiphong served as the most important maritime city of North Vietnam, and it became one of direct-controlled municipalities of a reunified Vietnam with Hanoi and Ho Chi Minh City in 1976. In the 21st century, Haiphong has emerged as a trading gateway, modern, green industrial city of Vietnam, oriented to become the third special-class city of Vietnam by 2030 to 2050 at the latest.