Ma On Shan is a saddle-shaped peak in east of Tolo Harbour in the New Territories of Hong Kong. With a height of 702 metres (2,303 ft), it stands among the ten highest mountains in Hong Kong. The mountain borders Sha Tin and Tai Po districts.

Ma On Shan is a new town along the eastern coast of Tolo Harbour in the New Territories of Hong Kong. Although it was initially an extension of Sha Tin New Town, it has its own town centre and various government facilities, and is now classified as a separate new town in government reports. Administratively, it belongs to Sha Tin District.