Rang Ghar (Assamese: ৰং ঘৰ, rong ghor) (meaning "Amusement House") is a two-storied building, which was the royal sports-pavilion from which the Ahom kings and nobles witnessed games like buffalo fights and other sports at the Rupahi Pathar (pathar meaning field in Assamese) specially during Rangali Bihu festival in the Ahom capital, Rangpur. On the roof of the Rang Ghar is a design of an Ahom royal long boat. The building was constructed during the reign of Swargadeo Pramatta Singha in 1746. It is located north east to the Talatal Ghar a multi-storied royal complex in Joysagar west of Sivasagar town, on the other side of the Assam Trunk (AT) Road in Sibsagar district in Assam, India .
The Rang Ghar is said to be the oldest amphitheater in Asia .The base of the monument has a series of arched entrances and atop the roof is a decorative pair of carved stone crocodiles. In many of these, only the brick framework exists with vestiges of sculptural adornments here and there. The Ahoms, who used special thin baked bricks, did not have the use of cement and, therefore, used a paste of rice and eggs as mortar for their construction. They also made use of powdered mixed lime and bricks to cover the surface of the inner walls. It is said that this layer of powder used to keep the inside of Ranghar cool. The entrance to Sankardev Kalakshetra at Guwahati is made in the style of the Rang Ghar.
The Rang Ghar was the logo of the recently concluded 33rd National Games that was held from 9 to 18 February, 2007 in Guwahati, Assam.
About a kilometer towards the north east of Rangh Ghar is the Jaysagar Pukhuri. It is a manmade tank, encompassing an area of about 120 Bighas of land. It was dug in memory of Rani Joymati, the mother of Rudra Singha, the most illustrious of the Ahom kings.