Girl Scouts of the United States of America (GSUSA), commonly referred to as simply Girl Scouts, is a youth organization for girls in the United States and American girls living abroad. Founded by Juliette Gordon Low in 1912, it was organized after Low met Robert Baden-Powell, the founder of Scouting, in 1911. Upon returning to Savannah, Georgia, she telephoned a distant cousin, saying, "I've got something for the girls of Savannah, and all of America, and all the world, and we're going to start it tonight!"

Girl Scouts prepares girls to empower themselves and promotes compassion, courage, confidence, character, leadership, entrepreneurship, and active citizenship through activities involving camping, community service, learning first aid, and earning badges by acquiring practical skills. Girl Scouts' achievements are recognized with various special awards, including the Girl Scout Gold, Silver, and Bronze Awards.

Girl Scout membership is organized according to grade, with activities designed for each level. GSUSA is a member of the World Association of Girl Guides and Girl Scouts (WAGGGS) and accepts girls of all backgrounds.

A 1994 Chronicle of Philanthropy poll showed Girl Scouts ranked by the public as the eighth "most popular charity/non-profit in America" among more than 100 charities. It describes itself as "the world's preeminent organization dedicated solely to girls."