Bradbury is a city in the San Gabriel Valley region of Los Angeles County, California, United States. It is located in the foothills of the San Gabriel Mountains below Angeles National Forest. Bradbury is bordered by the city of Monrovia to the west and south, and Duarte to the south and east. The population was 1,048 at the 2010 census, up from 855 at the 2000 census. The city has three distinct areas—the Bradbury Estates, which is a gated community consisting of 5-acre (20,000 m2) minimum estates; Woodlyn Lane, which is also a gated community with minimum 2-acre (8,100 m2) lots; and the balance of the city, which is not gated, which has lots generally ranging in size from 7,500 square feet (700 m2) to 1-acre (4,000 m2). A significant portion of the properties in Bradbury Estates and Woodlyn Lane are zoned for horses, and several horse ranches still exist within these communities today.

The San Gabriel Mountains comprise a mountain range located in northern Los Angeles County and western San Bernardino County, California, United States. The mountain range is part of the Transverse Ranges and lies between the Los Angeles Basin and the Mojave Desert, with Interstate 5 to the west and Interstate 15 to the east. The range lies in, and is surrounded by, the Angeles and San Bernardino National Forests, with the San Andreas Fault as its northern border.