Shui Chuen O, Mountain in Sha Tin District, Hong Kong.

Shui Chuen O is a mountain peak in the New Territories of Hong Kong, sitting between Lion Rock Country Park and Ma On Shan Country Park. It belongs to Sha Tin District and is flanked on all sides by large housing estates that have grown around its base over recent decades.

The peak was part of a rural and largely open landscape in the New Territories until the second half of the 20th century. From the 1980s onward, Hong Kong's rapid expansion brought large housing estates to the land around it.

The name Shui Chuen O is Cantonese for "water spring bay", referring to the streams that still run down both sides of the 372-metre summit. The peak's English alias, Sugar Loaf Peak, comes from its rounded profile. Hikers on the Tsing Sha Ancient Trail pass a barbecue site, a pavilion and reach the Kwun Yam Temple at Tsz Wan Shan.

The main hiking route, the Ci Sha Ancient Trail, starts from a small path beside Yuet Chuen House in Shui Chuen O Estate and passes a barbecue site, the Lion Pavilion and Sha Tin Pass Road before reaching the Kwun Yam Temple on Tsz Wan Shan. The peak lies within Ma On Shan Country Park, and the trail crosses residential areas first.

English speakers sometimes call the peak Sugar Loaf Peak, a name with no official standing in Hong Kong. The nickname likely comes from the shape of the summit, which resembles a rounded sugar loaf when seen from certain angles.