The Battle of Rạch Gầm-Xoài Mút (Vietnamese: Trận Rạch Gầm – Xoài Mút, Thai: การรบที่ซากเกิ่ม-สว่ายมุต) was fought between the Vietnamese Tây Sơn forces and an army of Siam in present-day Tiền Giang Province on January 20, 1785. It is considered one of the greatest victories in Vietnamese history.