Hazen, as a person, may refer to:
- Hazen Argue (1921-1991), Canadian politician
- Hazen S. Pingree (1840-1901), Detroit mayor and Michigan governor
- Chester Hazen, American businessman and politician
- John Douglas Hazen (1860-1937), Canadian politician
- Mick Hazen, As the World Turns actor
- Moses Hazen (1733-1802), American general
- Paul Hazen, American businessman
- Robert Leonard Hazen (1808–1874), Canadian politician
- William Babcock Hazen (1830-1887), American general
Hazen, as a place, may refer to:
- Hazen, Arkansas, a city in Prairie County, Arkansas, United States
- Hazen, North Dakota, a city in Mercer County, North Dakota, United States
- Hazen, Nevada, an unincorporated community in Churchill County, Nevada, United States
- Hazen Bay, a bay of the Bering Sea, Alaska, United States
- Lake Hazen, the northernmost lake of Canada
- Hazen High School, a school in Renton, Washington, United States
Hazen may also refer to:
- Hazen Street, an American pop punk group
- Hazen-Williams equation, a pressure loss formula
- Canon Hazen (Greyhawk) of Veluna, a fictional character
- Hazen unit, a unit of measurement for the discolouration of water