Ma Xulun (simplified Chinese: 马叙伦; traditional Chinese: 馬敘倫; Wade–Giles: Ma Hsü-lun, 27 April 1885 – 4 May 1970), courtesy name Yichu (Chinese: 彝初), was a Chinese politician, activist, and linguist. He was one of the co-founders of the China Association for Promoting Democracy.