Rommaninat Park or spelt Romaneenart Park (Thai: สวนรมณีนาถ, pronounced [sǔan rōm.mā.nīː.nâːt]; lit. 'park of woman who was regent'), commonly known as Khuk Kao (คุกเก่า, lit: "old prison") is a public park in Samran Rat Subdistrict, Phra Nakhon District, Bangkok. It is flanked by Siriphong and Maha Chai Roads, the total area is about 29 rai (round about 11 acres).

The park is located on the former site of Klong Prem Prison (เรือนจำคลองเปรม), built on the royal initiative of King Chulalongkorn (Rama V) in 1890, modeled after HM Prison Brixton in London Borough of Lambeth, United Kingdom. The prison had changed names several times, most recently in 1972 renamed to Bangkok Remand Prison (เรือนจำพิเศษกรุงเทพ). Crown Prince Vajiralongkorn (later King Maha Vajiralongkorn (Rama X)) presided over the official opening of Rommaninat Park and Corrections Museum on August 17, 1999.

Certified guide dogs are allowed in this park.

This park also serves as terminal of BMTA's bus line 42. Also be easily accessed by Sam Yot MRT station of MRT Blue Line and MRT Purple Line In Future it is located in the same neighbourhood as Wat Suthat, Sao Chingcha, Sala Chalermkrung Royal Theatre or Wang Burapha.

• Bangkok Corrections Museum – museum within the park
• Saranrom Park – nearest public park

• Official Thai Website
• "ROMANEENART PARK". TAT.