Gao Xu (Chinese: 高旭; pinyin: Gāo Xù; Wade–Giles: Kao Hsü/Kao Hsu; 1877－1925), was a Chinese poet, writer, revolutionary, political activist. Gao is one of the three founders of the South Society which was the largest organization of literature and poetry during the late Qing Dynasty China and the early period of the Republic of China. Gao is also one of the founding members of Tongmenghui led by Sun Yat-sen.