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Directory of Charities and Nonprofit Organizations

GuideStar is the most complete source of information about U.S. charities and other nonprofit organizations there is. Search our database of more than 1.8 million IRS-recognized organizations to find a charity to support, benchmark your own nonprofit's performance, research the sector, and more.

Browse by Category

Environment and Animals

Environmental organizations are dedicated to reclaiming and preserving natural resources and to beautifying the world around us. They range from recycling programs to wetlands management to garden clubs.

Animal nonprofits include humane societies and SPCAs, bird and wildlife sanctuaries, fisheries, veterinary organizations, zoos, and animal-training nonprofits.