Gardena is a city located in the South Bay region of Los Angeles County, California, United States. The population was 61,027 at the 2020 census, up from 58,829 at the 2010 census. Until 2014, the U.S. census cited the City of Gardena as the place with the highest percentage of Japanese Americans in California. Gardena's Japanese American population contributes to the South Bay region of Los Angeles being home to the highest density of Japanese companies within the mainland United States.