Marine Corps Base Camp Pendleton is the major West Coast base of the United States Marine Corps. It is located on the Southern California coast, in San Diego County, and bordered by Oceanside to the south, Cleveland National Forest, Orange and Riverside counties to the north, and Fallbrook to the east.

The base is split into North and South and was established in 1942 to train U.S. Marines for service in World War II. By October 1944, Camp Pendleton was declared a "permanent installation" and by 1946, it became the home of the 1st Marine Division. It was named after Major General Joseph Henry Pendleton (1860–1942), who had long advocated setting up a training base for the Marine Corps on the west coast. Today it is the home to myriad Operating Force units including the I Marine Expeditionary Force and various training commands.