The Lumbwa (also Lumbua, Umpua, Humba and Wakwavi) were a pastoral community which inhabited southern Kenya and northern Tanzania. The term Lumbwa has variously referred to a Kalenjin-speaking community, portions of the Maa-speaking Loikop communities since (at least) the mid-19th century, and to the Kalenjin-speaking Kipsigis community for much of the late 19th to mid-20th centuries.
By the late-19th century, the term as an identity was largely out of use, but had taken on pejorative connotations of those who had abandoned pastoralism and war culture in exchange for agricultural lifestyle.