Mu Zeng (Chinese: 木增, September 19, 1587 – September 9, 1646), also known as A-chai A-ssu in Nakhi, was the native chieftain of Lijiang between 1597 and 1623.

He was born to Mu Qing (Chinese: 木青) and Ashijia (Chinese: 阿室加) and ascended the throne when he was ten years old.

The chieftain was known for his literature and wrote many anthologies.

[1][2] In 1624, he announced his privacy and gave his position to his son, Mu Yi (Chinese: 木懿).

[2] Mu Zeng welcomed Xu Xiake when he came to Lijiang in 1640.