Rommaninat Park or spelt Romaneenart Park (park of woman who was regent"), commonly known as Khuk Kao ("old prison") is a public park in Bangkok. Located between Siriphong and Maha Chai Roads, Samran Rat Subdistrict, Phra Nakhon District between Giant Swing, Wat Suthat and Sala Chalermkrung Royal Theatre. The total area is about 29 rai (round about 11 acres).

The park is located on the former site of Klong Prem Prison, built on the royal initiative of King Chulalongkorn (Rama V) in 1890, later in 1972 renamed to Bangkok Remand Prison. Crown Prince Vajiralongkorn (later King Maha Vajiralongkorn (Rama X)) presided over the official opening of Rommaninat Park and Corrections Museum on August 17, 1999.