Ruth is a unincorporated community in Trinity County, California, United States.

It is located near the headwaters of the Mad River and adjacent to the Yolla Bolly-Middle Eel Wilderness.

For statistical purposes, the United States Census Bureau has defined Ruth as a census-designated place (CDP).

42 households (42.4%) were made up of individuals, and 12 (12.1%) had someone living alone who was 65 years of age or older.

There were 315 housing units at an average density of 7.8 per square mile (3.0/km2), of which 73 (73.7%) were owner-occupied, and 26 (26.3%) were occupied by renters.

[6] Federally, Ruth is in California's 2nd congressional district, represented by Democrat Jared Huffman.