San Wai () or San Wai Tsuen () is a village in the San Tin area of Yuen Long District, Hong Kong.
San Wai is one of the villages represented within the San Tin Rural Committee. For electoral purposes, San Wai is part of the San Tin constituency, which is currently represented by Man Fu-wan.
San Tin Ha San Wai () and San Tin Sheung San Wai (), part of San Wai, are recognized villages under the New Territories Small House Policy.
San Wai Tsuen was originally called Fuk Hing Lei (), and was founded by the Wong and Chiu families.