Łazienki Park (Polish: Park Łazienkowski or Łazienki Królewskie, literally "Baths Park" or "Royal Baths"; often rendered "Royal Baths Park") is the largest park in Warsaw, Poland, occupying 76 hectares of the city center.
The park-and-palace complex lies in Warsaw's central district (Śródmieście), on Ujazdów Avenue (Aleje Ujazdowskie) on the "Royal Route" linking the Royal Castle with Wilanów palace to the south. North of Łazienki Park, on the other side of Agrykola Street, stands Ujazdów Castle.
Łazienki Park was designed in the 17th century by Tylman van Gameren, in the baroque style, for Stanisław Herakliusz Lubomirski. It took the name Łazienki ("Baths") from a bathing pavilion that was located there.
The development of the classical-style gardens became a major project for King Stanisław August. The park-and-palace complex was designed by Domenico Merlini, Johann Christian Kammsetzer and landscape gardener Jan Chrystian Schuch. Its principal buildings stand beside or near the Łazienki Lake and Łazienki River. Stanisław August's palace is situated on the lake and hence is known as the "Palace on the Water."