Kiến Xương [kiən˧˥:sɨəŋ˧˧] is a rural district of Thái Bình province in the Red River Delta region of Vietnam.

According to An Nam chí lược, An Nam chí nguyên and Đại Việt sử ký toàn thư,[1] from the Tang to the Revival Lê Dynasty, the area of ​​Kiến Xương was originally the Northern part of Chân Định rural district (真定縣, Chân Định huyện),[note 2] which was separated from the Southern part by the downstream of the Red River.

On June 8, 1988, according to Decision 102-HĐBT[note 5] of the Council of Ministers, Kiến Xương township (thị trấn Kiến Xương) was officially established in the area of hamlets Quang Trung and Tân Tiến, both belonging to Tán Thuật commune.

On April 12, 2002, arcording to Decree 45/2002/NĐ-CP of the Government of Vietnam, continuing to consolidate Kiến Xương township and Tán Thuật commune to establish Thanh Nê township (thị trấn Thanh Nê).

[note 6] Currently, Kiến Xương rural district is divided into 29 commune-level administrative units.