Dyak, or Dayak, indigenous people of Sarawak, largest state in Malaysia on the island of Borneo. Living by fishing and hunting, the Dyak have been little affected by modern civilization. There are two groups: Iban, who live along the seacoast and rivers, and Land Dyak, who live inland and call themselves by the name of their village or locality. The Dyak live in longhouses and grow crops communally. They practice the religious cults of shamanism and animism.