Lubukusu (also known simply as Bukusu) is a Bantu language spoken by the Babukusu people of western Kenya. It is spoken by about 1.2 million Babukusu people, particularly in the counties of Bungoma, Kakamega, and Trans-Nzoia. The Bukusu are the largest single subtribe of the Luhya nation, accounting for nearly 30% of the entire Luhya population.

Lubukusu carries the ISO 639-3 code bxk and belongs to the Masaba branch of the Bantu language family. It is more closely related to the Gisu and Masaaba languages of eastern Uganda, and is mutually intelligible with those languages , reflecting shared historical and cultural ties across the Kenya-Uganda border. The language is taught in some primary schools and used in literature and on the radio. Three main regional dialects of Lubukusu are recognised, centred around the Kitale, Bungoma west, and Webuye east areas.

This collection brings together linguistic materials documenting Lubukusu, including audio recordings, grammatical descriptions, lexical data, and transcribed texts, supporting the preservation and academic study of this well-documented Luhya language.