Hlersu (Lesu 勒苏), or Sansu (Shansu 山苏/散苏), is a Loloish language of Yunnan Province, China.

It is spoken in Xinping, Jinping, Zhenyuan, Eshan (as Shansu 山苏),[2] and (as Sansu) Yuanjiang County.

Hlersu (autonym: ɬɛɾ55 sɨ55 pʰa21; exonym: ɬɛɾ55 sɨ55 pʰo21; so33 su33 pʰa21) autonym reported in Yunnan (1955)[3]) is spoken by ethnic Hlersu people, who live in 13 townships (50 administrative villages and 143 hamlets).

There are 4,040 households and 15,737 individuals in Xinping, Yuanjiang, and Eshan counties (Xu & Bai 2013:1).

The Hlersu dialect documented by Xu & Bai (2013) is that of Pujiehei 普杰黑, Daxi Village 大西村, Tadian Town 塔甸镇, Eshan County.