Six Flags AstroWorld, also known simply as AstroWorld, was a seasonally operated amusement park in Houston, Texas. Owned and operated by Six Flags, the park was situated between Kirby Drive and Fannin Street, directly south of I-610. The park opened on June 1, 1968, and was developed originally and constructed as part of the Astrodomain, the brainchild of local philanthropist and former Houston mayor Roy Hofheinz, who intended it to complement the Astrodome. The Hofheinz family sold AstroWorld to Six Flags in 1978.

Six Flags Entertainment Corporation, formerly Six Flags Theme Parks, Inc., is an American amusement park corporation, headquartered in Arlington, Texas. It has properties in Canada, Mexico, and the United States. Six Flags owns the most theme parks and waterparks combined of any amusement-park company and has the seventh highest attendance in the world. The company operates 27 properties throughout North America, including theme parks, amusement parks, water parks, and a family entertainment center. In 2019, Six Flags properties hosted 32.8 million guests.