Yan Ruoju (Chinese: 閻若璩; Wade–Giles: Yen Jochü, November 11 1636 - July 9 1704) was an influential Chinese scholar from the early Qing Dynasty. He was born to a scholarly family in Taiyuan, Shanxi. Yan Ruoju is most famous for proving that 25 chapters of the Classic of History were forgeries. He also made observations and theories about the motions of the moon and the planets.