Jianchang is a county of Huludao City in the southwest of Liaoning province, China. It is the largest division of Huludao, covering an area of 3,195 square kilometres (1,234 sq mi), with a population of 450,000 recorded in 2020.
The county lies in mountainous terrain about 85 kilometres (53 mi) west of Huludao city. It is served by China National Highway 306, and the Weizhangzi–Tashan railway also passes through the county.