Wongwian Yai, also spelled "Wong Wian Yai" or "Wongwien Yai" (Thai: วงเวียนใหญ่, pronounced [wōŋ.wīa̯n jàj]), is a large roundabout (traffic circle) in Thonburi, on the west bank of the Chao Phraya River in Bangkok, Thailand, where the statue of King Taksin is situated.

It overlaps between the four sub-districts of two districts, Bang Yi Ruea and Hiran Ruchi of Thon Buri with Somdet Chao Phraya and Khlong San of Khlong San in the centre of Bangkok, at the intersection of Prajadhipok/ Intharaphithak/ Lat Ya/ Somdet Phra Chao Taksin Roads. Nearby is Wongwian Yai Station, a historical commuter railway terminal to Maha Chai (local name of Samut Sakon provincial city) and Mae Khlong (Samut Songkhram), a southwestern suburb of Bangkok.