Hager is the surname of several people:
- Åke Häger (1897–1968), Swedish gymnast
- Alva Hager (1850–1923), American politician
- Axel Hager (born 1969), German beach volleyballer
- Britt Hager (born 1966), former American football linebacker
- Cassie Hager (born 1984), American basketball player
- Chris Hager, guitarist
- David Hager, American physician
- Friderich Christian Hager (1756–1795), Danish colonial commander and governor
- Hager Twins, Jim (1941-2008) and Jon (1941-2009), American country music singers
- Jake Hager (born 1982), also known as Jack Swagger, a professional wrestler
- Jenna Hager (born 1981), daughter of President George W. Bush
- John "Dok" Hager (1858–1932), American cartoonist
- John Henry Hager (born 1936), American politician
- John Sharpenstein Hager (1818–1890), American politician
- Kristen Hager (born 1984), Canadian actress
- Leopold Hager (born 1935), Austrian conductor
- Liz Hager, American politician
- Mandy Hager, New Zealand writer
- Mark Hager (born 1964), former Australian field hockey player
- Nicky Hager (born 1958), New Zealand author and investigative journalist
- Peter Hager 2d (1784-1854), New York politician
- Robert Hager, NBC News analyst
- Rocky Hager, American football player
- Shraga Feivel Hager, rebbe of the Kosov Hasidic dynasty
- Steven Hager (born 1951), counterculture and marijuana activist
- Tobias Hager (born 1973), German footballer