Mount Kinabalu (Gunung Kinabalu, Dusun: Gayo Ngaran or Nulu Nabalu) is the highest mountain in Borneo and Malaysia. With an elevation of , it is third-highest peak of an island on Earth, and 20th most prominent mountain in the world by topographic prominence. The mountain is located in Ranau district, West Coast Division of Sabah, Malaysia. It is protected as Kinabalu Park, a World Heritage Site.
In 1997, a re-survey using satellite technology established its summit (known as Low's Peak) height at above sea level, which is some less than the previously thought and hitherto published figure of .
The mountain and its surroundings are among the most important biological sites in the world, with between 5,000 and 6,000 species of plants, 326 species of birds, and more than 100 mammalian species identified. Among this rich collection of wildlife are famous species such as the gigantic Rafflesia plants and orangutans. Mount Kinabalu has been accorded UNESCO World Heritage status.