Gargaon is a historic city in Assam, India and served as the capital of the Ahom kingdom for many years. It was built by the Ahom king Suklenmung in 1540. It lies 13 km east of present-day Sivasagar City, headquarters of the Sivasagar district. The palace structures were made of stone and wood. In 1747 Pramatta Singha, son of Rudra Singha, constructed a brick wall of about 5 km in length surrounding the Gargaon palace and the masonry gate leading to it.