RollerCoaster Tycoon is a 1999 construction and management simulation video game developed by Chris Sawyer and published by Hasbro Interactive. It was released for Windows and was later ported to the Xbox by Frontier Developments in 2003. It is the first game in the RollerCoaster Tycoon series.

RollerCoaster Tycoon received two expansion packs: Added Attractions (released in the US as Corkscrew Follies) in 1999, and Loopy Landscapes in 2000. Two special editions were released: RollerCoaster Tycoon Gold/Totally Roller Coaster in 2002, which contained the original game, Added Attractions/Corkscrew Follies, and Loopy Landscapes; and RollerCoaster Tycoon Deluxe in 2003, which contained the content in Gold plus more designs for the different customizable rides.

The premise of the game is to complete a series of preset scenarios by successfully building and maintaining amusement parks through business ownership as a theme park entrepreneur. Players can choose from dozens of roller coaster types and can also build log flumes, carousels, bumper cars, haunted houses, go-karts, Ferris wheels, and swinging ships, among other rides.

The player may hire handymen to sweep paths, empty garbage cans, water flowers and mow lawns; mechanics to inspect and fix rides; security guards to prevent vandalism within the park; and entertainers to entertain the guests. The geography and landscaping of the park can be modified, allowing the player to lower/raise terrain and add water to improve the park’s attractiveness, as well as to allow rides to fit into their surroundings more easily. Players must also balance the needs of the visitors by strategically placing food stalls, concession stands, bathrooms, and information kiosks.