Fallbrook is an unincorporated census-designated place located in northern San Diego County, California, in the United States. It is one of the largest unincorporated communities within the county, with a recorded population of 32,267 as of the 2020 United States census.
The community is situated immediately east of Marine Corps Base Camp Pendleton. Fallbrook is widely recognized for its extensive avocado groves and identifies itself as the "Avocado Capital of the World." To celebrate this agricultural identity, the area hosts an annual Avocado Festival on Main Avenue.