Abang Haji Muhammad Salahuddin bin Abang Barieng (né Louis anak Barieng; Jawi: ابڠ محمد صلاح الدين بن ابڠ باريئڠ; 27 August 1921 – 28 January 2022) was a Malaysian politician who served as the third Yang di-Pertua Negeri of Sarawak from 1977 to 1981, and as the sixth Yang di-Pertua Negeri from 2001 to 2014.

After the Japanese occupation, he worked as Municipal Inspector until 1947 under the new British colonial administration.

He acted as representative of the Melanau community to the Cobbold Commission during the years preceding the formation of Malaysia.

In 2000, he became the acting Yang di-Pertua Negeri while his successor Ahmad Zaidi Adruce was ill.[3] Ahmad Zaidi died in December 2000, and Abang Muhammad Salahuddin was reappointed permanently to the governorship in February 2001, and his term officially ended on 28 February 2014.

[4] Salahuddin died at the Normah Sarawak Medical Centre in Petra Jaya, on 28 January 2022, at the age of 100.