Grossmont can mean:
- A neighborhood in western El Cajon, California and northern La Mesa, California.
- Grossmont College, a community college in El Cajon, California
- Grossmont High School, in La Mesa, California
- Grossmont Middle College High School, in El Cajon, California
- Grossmont Transit Center (MTS Transit Center), a San Diego Trolley station
- The Grossmont Union High School District in San Diego County, California