Mo Piu (Mơ Piu) is an unclassified Hmongic language spoken in the village of Nậm Tu Thượng, Nậm Xé Township, western Văn Bàn District, Lào Cai Province.
[2] It was first documented in 2009 by a team of French linguists as part of the MICA Institute's "Au Co" Project.
Geneviève Caelen-Haumont reported 237 speakers as of 2011.
She notes that Mo Piu is highly divergent from neighbouring Hmongic languages in Vietnam.
[1] Ly Van Tu & Vittrant (2014) tentatively classify Mo Piu as a Guiyang Miao dialect.