Zhou Ruchang (Chinese: 周汝昌; Wade–Giles: Chou Ju-ch'ang; April 14, 1918 – May 31, 2012), was a Chinese writer noted for his study of the novel Dream of the Red Chamber by Cao Xueqin. He is regarded as among the most renowned and influential redologists of the 20th century. In addition, Zhou was also an accomplished calligrapher and expert on traditional Chinese poetry and fiction.