Lanjak Entimau Wildlife Sanctuary, Protected rainforest area in Sarawak, Malaysia.

Lanjak Entimau Wildlife Sanctuary is a large protected rainforest area in Sarawak with multiple vegetation types and diverse wildlife. The forest spans vast terrain and contains various habitats that support different animal populations.

The area was established as a protected zone in 1983 by Sarawak's Forest Department to safeguard natural resources and wildlife populations. This designation marked an important effort to preserve endangered forest areas and the species within them.

The sanctuary's name combines Lanjak and Entimau, and its hill Bukit Lanjak rises to 1,284 m, the highest point in the reserve. The area is managed by Sarawak's Forest Department, which lists it among the state's protected forests and posts information on its official website. The reserve borders Batang Ai National Park to the south and Indonesia's Betung Kerihun National Park to the southeast.

The sanctuary lies in southwestern Sarawak, bordered to the south by Batang Ai National Park and to the southeast by Indonesia's Betung Kerihun National Park. Its terrain runs from about 60 m up to Bukit Lanjak at 1,284 m, with the watershed between the Rajang and Lupar rivers inside the reserve. Access is by river, and the Forestry Department's permit must be arranged beforehand.

The sanctuary adjoins Batang Ai National Park to the south and Indonesia's Betung Kerihun National Park to the southeast; in 2004 the two were jointly proposed as a World Heritage Site called the "Transborder Rainforest Heritage of Borneo". The sanctuary's highest point is Bukit Lanjak, 1,284 m, on the watershed between the Rajang and Lupar rivers.