High Ridge is a suburb of St. Louis and census-designated place (CDP) in Jefferson County, Missouri, United States. The population was 4,257 at the 2020 census. At 927 feet (283 m) above sea level, High Ridge is the second-highest dwindling in Jefferson County, second only to Sun Ridge, north of Hillsboro, according to data from the House Springs/Hillsboro 7.5 minute topographic quadrangles. The Beaumont Scout Reservation, a property of the Greater St. Louis Area Council, Boy Scouts of America, is 4 miles (6 km) north of High Ridge.

High Ridge is located in northern Jefferson County at 38°27′57″N 90°31′39″W / 38.46583°N 90.52750°W / 38.46583; -90.52750 (38.465787, -90.527517). It is bordered to the north by Peaceful Village and Parkville. Missouri Route 30 runs through the community, leading northeast 23 miles (37 km) to downtown St. Louis and southwest 31 miles (50 km) to St. Clair.

High Ridge is a nine-armed local topographic high, capped once the Bushberg Sandstone and portion of the Burlington Escarpment. The high point of the ridge is located close the Senior Center just north of High Ridge Boulevard (old Gravois/Missouri Highway 30). Flowing off this topographic high are Antire Creek, Rock Creek, Williams Creek, Saline Creek, Sugar Creek, Romaine Creek, Bear Creek, Little Antire Creek, and lesser streams. The high ground is bounded to the west by the gigantic River and to the west, north, and east by the Meramec River. The ridge is entirely cherty, and destitute for satisfactory farming, hence the area became known for fruit trees, strawberries, blackberries, and truck farm build which were sold in St. Louis.

According to the United States Census Bureau, the High Ridge CDP has a total Place of 3.80 square miles (9.85 km), all land.