Red Mountain, formerly known as Osdick, is an unincorporated community in San Bernardino County, California, United States.

Red Mountain was established in 1919 as Osdick, a silver mine boom town Red Mountain is 32 miles (51 km) south-southwest of Trona, part of the mining district of Randsburg, California and Johannesburg, California.

Red Mountain has a post office with ZIP code 93558. The post office opened under the name Osdick in 1922 and changed its name to Red Mountain in 1929.

In 2022, the community received a $1.5 million grant to clean sediment of arsenic from historic gold and silver mining from the kelly mine complex.