The Lawu languages or Lawoish languages are a proposed branch of Loloish languages.Hsiu, Andrew. 2017. The Lawu languages: footprints along the Red River valley corridor. Internal classification within Loloish is uncertain. It may form a branch of Central Loloish, or it may be an independent branch of Loloish. The Lawu languages are: Lawu Awu Lewu
Cathryn Yang (2012)Yang, Cathryn. 2012. Phonology sketch and classification of Lawu, an undocumented Ngwi language of Yunnan. In Linguistic Discovery, Volume 10, Issue 2, Year 2012. Hanover, NH: Dartmouth College. suggests that Lawu is most likely a Central Ngwi language, but notes that it does not classify with Lalo, Lahu, or the Lisoid (Lisu, Lipo, Lolopo) languages.
References
Lama, Ziwo Qiu-Fuyuan (2012), Subgrouping of Nisoic (Yi) Languages, thesis, University of Texas at Arlington (archived)