The Tides Foundation is an American public charity and fiscal sponsor working to advance progressive causes and policy initiatives in areas such as the environment, health care, labor issues, immigrant rights, LGBTQ+ rights, women's rights and human rights. It was founded in San Francisco in 1976. Through donor advised funds, Tides distributes money from anonymous donors to other organizations, which are often politically liberal. It manages two centers in San Francisco and New York that offer collaborative spaces for social ventures and other nonprofits.