Longstreet, as a surname of English origin, may refer to the following people:
- Augustus Baldwin Longstreet (1790-1870), American humorist, lawyer, college president, Southerner, writer
- Helen Dortch Longstreet (1863-1962), American author and feminist
- James Longstreet (1821-1904), Confederate general
- Stephen Longstreet (1907-2002), American author
- Place names
- Longstreet, Louisiana, a place in the United States
- Longstreet, a settlement in the civil parish of Enford, Wiltshire, in the United Kingdom
- Long Street, a hamlet in the United Kingdom
- Other uses
- Longstreet (TV series), a television series about a blind detective
- Longstreet (film), a made-for-television movie
- SS James Longstreet, U.S. Liberty Ship during World War II