Wu Kai Sha, formerly known as Wu Kwai Sha or U Kwai Sha, is a place at the shore of Tolo Harbour, northwest of Ma On Shan in the New Territories, Hong Kong. Wu Kai Sha is within the Sha Tin District, one of the 18 districts of Hong Kong. The name roughly translates as Black Sand Creek, based on the accumulation of black iron ore which traditionally flowed down from the Ma On Shan (peak).

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.