Tho Chau Island or Tho Chau Island (Vietnamese Thổ Châu or Thổ Chu) is a Vietnamese archipelago in the Gulf of Thailand.
In the 1970s, during the Cambodian-Vietnamese War, Khmer Rouge forces attacked and occupied the island for a short time before Vietnam reclaimed it with a larger force. Being left on the island without any means to escape, most of the Khmer Rouge soldiers were killed. The casualties of both sides are unknown. In the early 1980s, human bones could be seen scattered around the Island. This is likely the bloodiest events in the history of this small Island.