Changhsu Hamilton Hsu (Chinese: ???; pinyin: Xú Zhìmó; Wade–Giles: Hsü Chih-mo, January 15, 1897 – November 19, 1931), original name Xu Zhangxu (Chinese: ???; pinyin: Xú Zhangxù; Wade–Giles: Hsü Chang-hsü), courtesy names Yousen (Chinese: ??; pinyin: Yousen; Wade–Giles: Yu-sen) and later Zhimo, which he went by, was an early 20th-century romantic Chinese poet who strove to loosen Chinese poetry from its traditional forms and to reshape it under the influences of Western poetry and the vernacular Chinese language.
He is considered one of the most important figures of modern Chinese poetry.