Operation Lam Son II (Vietnamese: chiến dịch Lam Sơn II) was a combined United States and South Vietnamese military and public relations operation in the village of Tân Phước Khánh, Tân Uyên District, in III Corps around 40 km north of the capital Saigon staged from June 2 to June 5, 1966 during the Vietnam War. It was done in order to simultaneously win public support (hearts and minds) for the government of South Vietnam by holding a village fair and providing social services while simultaneously screening the congregated area to arrest and remove Viet Cong guerrillas operating in the area.