Siwei
Siwei may refer to:

People
 Cheng Siwei, Chinese economist, chemical engineer and politician
 MaSiWei (马思唯 Siwei Ma), member of Higher Brothers 
 Zheng Siwei, Chinese badminton player

Place
 Siwei Subdistrict, a township-level division of Jingxing Mining District, Shijiazhuang, Hebei, China
 Sihwei village (四維村), a village in Nangan Township, Lienchiang County

See also
 Chou Hsi-wei (Jhou Siwei, 周錫瑋; pinyin: Zhōu Xíwěi), Taiwanese politician
 Jiugong Tunnel or Siwei Tunnel, a tunnel in Lieyu Township, Kinmen County
 Sihwei Elementary School metro station, a metro station of the Taichung Metro 

Chinese given names