Belva Cottier (June 27, 1920 – May 2, 2000) was an American Rosebud Sioux activist and social worker. She proposed the idea of occupying Alcatraz Island in 1964 and was one of the activists who led the protest for return of the island to Native Americans. She planned the first Occupation of Alcatraz, and the suit to claim the property for the Sioux. Concerned for the health of urban Indians, she conducted a study for the Department of Health, Education and Welfare, which resulted in her becoming the executive director of the first American Indian Health Center in the Bay area in 1972.