Adin is a census-designated place in Modoc County, California. It is located 29 miles southwest of Alturas, and is situated at an elevation of 4203 feet. At the 2010 census the population was 272.
The town suffered devastating fires in 1904, 1915, 1931, and finally in 1939. Following the 1939 incident, the town organized a volunteer fire brigade. It was a sawmill town in the early twentieth century.