Spanx, Inc. is a U.S. company which mainly manufactures footless pantyhose and other undergarments for women, particularly "body shaping (Foundation garment)" undergarments intended to give the wearer a slim and shapely appearance. They have been endorsed by celebrities, like Oprah Winfrey and Miranda Lambert.

About 5.4 million Spanx power panties have been sold since the year 2000, and the global retail sales for Spanx products are exceeded $750 million for 2008.

Company founder Sara Blakely received the Ernst & Young Entrepreneur of the Year Award in 2002, and appeared on Fox (Fox Broadcasting Company)s 2004 reality television show titled The Rebel Billionaire: Bransons Quest for the Best. She has also appeared on the second season of American Inventor as a panel judge. She is a member of the Atlanta chapter of Entrepreneurs Organization.