Mount Tambuyukon or Tamboyukon (Malay: Gunung Tambuyukon, Dusun: Nulu Tambuyukon) is a mountain located at the West Coast and Kudat divisions of Sabah, Malaysia (located on the tripoints of three districts namely Ranau, Kota Belud as well as Kota Marudu). It is considered the third-highest mountain in the country with height at 2,579 metres (8,461 ft), lying north of the highest Mount Kinabalu.