Oak Glen is a census-designated place situated between the San Bernardino Mountains and the Little San Bernardino Mountains in San Bernardino County, California, United States. Oak Glen is located 15 miles east of San Bernardino, at an elevation of 4,734 feet (1,443 m). The population was 638 at the 2010 census.
The original settlers, the Cahuilla and the Serrano, harvested acorns; many metates can still be found in the streambeds where the acorns were leached. According to Huell Howser's 2005 California's Gold profile, the potato was the original crop grown by the first Caucasians to settle in the area.
The apple orchards produce the Vasquez and King David varieties, which are grown only in Oak Glen , as well as antique varieties no longer commercially available such as Ben Davis, Gravenstein, and Pink Pearl.