NASA's 7,500-square-foot (700 m2) parafoil used in the X-38 program is the world's largest.
https://diqn32j8nouaz.cloudfront.net...t_parafoil.jpg
Previously:
https://www.homemadetools.net/forum/...895#post152662
https://www.homemadetools.net/forum/...612#post139601
https://www.homemadetools.net/forum/...618#post128427
