The Yayasan Sabah Tower (officially known as Menara Tun Mustapha) is located in Kota Kinabalu, Malaysia. It was built in 1977 and it is the second tallest building in the island of Borneo after Wisma Sanyan in Sibu and followed by the Ministry of Finance Building in Bandar Seri Begawan, Brunei Darussalam. This 30-storey circular glass sculpture is 122 metres high, and is located in Kota Kinabalu, Sabah. It is named after Tun Datu Mustapha, a former Chief Minister of Sabah. The building used to be known as Sabah Foundation Building (Bangunan Yayasan Sabah). It has a revolving floor at the 18 floor, which slowly spins to provide a complete view of Likas Harbour. It makes one 360 degree rotation per hour.
In 1997, urban climber Alain Robert successfully scaled the building, with government approval, for a fundraiser.