Haiphong (Vietnamese: Hải Phòng, IPA: [haːj˧˩ fawŋ͡m˨˩] (listen)), or Hải Phòng, is the third-largest city in Vietnam. An industrial city, Haiphong is located at the mouth of the Cấm River in northern Vietnam and had a population of 2,358,741 in 2021. Haiphong is the center of technology, economy, culture, medicine, education, science and trade in the Red River Delta. In the past, Haiphong was the first place with electricity in Vietnam.

Haiphong was founded in 1887 as a major seaport city of Vietnam. 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.

Haiphong has a Human Development Index of 0.782 (high), ranking fourth among all municipalities and provinces of Vietnam.