The Kusaal language group of Ghana and Burkina Faso has a population of over 535,000 (2018 UNSD), and reside in the Upper East region: Bawku district.
The Kusaal language is classified as Niger-Congo, Atlantic-Congo, Volta-Congo, North, Gur, Central, Northern, Oti-Volta, Western, Southeast. The ISO code is kus. Alternate names are Kusaasi, Kusale, and Kusasi.

There are two dialects of Kusaal: Toende (Western Kusaal) 70,000 population, Agole (Angole, Eastern Kusaal) 350,000 population. Further investigation of the Toende dialect in Burkina Faso is needed. It has possible marginal intelligibility with Eastern (Angole) Kusaal. Many claim to be able to understand the related languages: Mòoré mos, Dagbani dag, Mampruli maw, and Farefare gur. Kusaal is a member of the Mòoré-Dagbani subgroup. Some also speak Hausa.

The Kusaasi highly value and use their language. Some literature has been produced in the language including a grammar and the Bible (2015).