Longyear may refer to:
- Longyearbyen, the largest settlement in Norway's Svalbard archipelago
- Barry Longyear, (born 1942), US science fiction author and screenwriter
- John Munroe Longyear (1850–1922), the founder of Longyearbyen
- John W. Longyear (1820–1875), U.S. Representative from Michigan
- Judith Q. Longyear (1938–1995), mathematician