Chandrabhanu or Chandrabhanu Sridhamaraja was the King of Tambralinga Kingdom in present-day Thailand, Malaysia and Sumatra and the Jaffna Kingdom in northern Sri Lanka. A Javaka, he was known to have ruled from during the period of 1230 until 1262. He was also known for building a well-known Buddhist stupa in southern Thailand. He spent more than 30 years in his attempt to conquer Sri Lanka. He was eventually defeated by the forces of the Pandyan Dynasty from Tamil Nadu in 1262 and was killed by the brother of the south Indian Emperor Jatavarman Sundara Pandyan.

Tambralinga was an Indianised kingdom located on the Malay Peninsula, existing at least from the 2nd to 13th centuries CE. It was under the influence of Srivijaya for some time, but later became independent from it. The name had been forgotten until scholars recognized Tambralinga as Nakhon Si Thammarat. In Sanskrit and Prakrit, tām(b)ra means "copper", "copper-coloured" or "red" and linga means "symbol" or "creation", typically representing the divine energy of Shiva.