The Xihoumen Bridge (Chinese: 西堠门大桥) is a suspension bridge on the Zhoushan Archipelago, the largest offshore island group in China.

The bridge forms part of the Yongzhou Expressway.

Built by the province of Zhejiang at a cost of 2.48 billion yuan (approximately US$363 million), construction began in 2005 and the main span was completed in December 2007.

The bridge was opened to traffic on a test basis on 25 December 2009, at 11:58 p.m., local time alongside the Jintang Bridge, before it is officially open for traffic.

[1][2] The opening date was delayed due to a ship collision on 16 November 2009 that slightly damaged the side of Jintang Bridge.