Cosumnes may refer to Cosumnes River in northern California, United States Cosumnes River Preserve near Sacramento, California Cosumnes River AVA, an American Viticultural Area in Sacramento County and San Joaquin County Cosumnes River College in Sacramento, California Cosumnes River College (Sacramento RT) a light rail station in Sacramento, California Cosumnes Oaks High School in Elk Grove, California Rancho Cosumnes in Sacramento County, California