The Pa Sak Jolasid Dam or Pa Sak Cholasit Dam (Thai: เขื่อนป่าสักชลสิทธิ์, Khuean Pa Sak Chonlasit) impounds the Pa Sak River at Ban Kaeng Suea Ten, Tambon Nong Bua, Phatthana Nikhom District, Lopburi Province, and Ban Kham Phran, Tambon Kham Phran, Wang Muang District, Saraburi Province, Thailand. It is the biggest reservoir in central Thailand.
