water park (occasionally written as waterpark) is an amusement park that features water play areas, such as water slides, splash pads, spraygrounds (water playgrounds), lazy rivers, or other recreational bathing, swimming, and barefooting environments. Water parks in more current states of development may also be equipped with some type of artificial surfing or bodyboarding environment such as a wave pool or FlowRider.

Water parks have grown in popularity since their introduction in the late 1940s and early 1950s. The United States has the largest and most concentrated water park market, with over a thousand water parks and dozens of new parks opening each year. Major organizations are IAAPA (International Association of Amusement Parks and Attractions) and WWA (World Waterpark Association).

Water parks emerging from spas continue to more closely resemble mountain resorts as they become four-season destinations-for example, Splash Universe Water Park Resort, a member of the World Water Park Association, is themed to match the community in which it is located. The theme is intended to enhance the communities' destination appeal. Therefore, the amusement and leisure time industry is becoming more concentrated as winter sports are becoming commonplace themes in summertime water rides. A process of concentration can be observed in the hybrid segments of theme-, amusement-, and water parks. Some water parks are more spa-oriented; e.g. Schwaben Quellen, a member of European Waterparks Association (EWA) has no water slides, but instead has many saunas, steam rooms, "adventure showers", and relaxation-oriented water play areas.^{[citation needed]}