The Roman Catholic Diocese of Yanji/Yenki is a diocese located in the city of Yanji in the Ecclesiastical province of Shenyang in China.
Yanji is a county-level city in the east of China's Jilin Province, and is the seat of the Yanbian Korean Autonomous Prefecture. Its population is approximately 400,000 of which a large portion is ethnic Korean. Yanji is a busy hub of transport and trade between China and North Korea.