Siam Park City, known in Thai as "Suan Siam" is an amusement and water park in the Khan Na Yao district of Bangkok. The park is separated into three main areas, the water park (Siam Lagoon), the amusement park (Siam X-treme) and a learning park (Siam Genius).

Siam Park is considered the biggest theme park, as well as biggest water park, in Southeast Asia, as well as the oldest water park in Thailand.