Kamarupi Prakrit, Kamrupi Apabhramsa, old Kamrupi dialect, Kamarupa dialect and proto-Kamrupa; was the Middle Indo-Aryan (MIA) used in ancient Kamarupa. This language is the historical ancestor of the Kamatapuri lects and the Assamese language; and can be dated prior to 1250 CE, when the proto-Kamta language, the parent of the Kamatapuri lects, began to develop. This sort of Sporadic Apabhramsa is a mixture of Sanskrit, Prakrit and colloquial dialects of Assam.

Kamrupi, a dialect of Assamese was the first ancient Aryan literary language spoken in Brahmaputra valley and North Bengal, developed primarily in the Kamrup and North Bengal. It is one of two western dialect groups of the Assamese language, the other being Goalpariya. The Kamrupi is heterogeneous with four dialects: Barpetiya, Nalbariya, Kamrupi and South Kamrupi. In medieval times, it is used by scholars and saints of Brahmaputra Valley and its adjoining areas for literary purposes in parallel with Sanskrit both for prose and poetry as against practices of literary figures of mid India like Vidyapati who uses Sanskrit for prose and Maithili for poetry. Recent times, the South Kamrupi dialect has been used in the works of author Indira Goswami with dramatic effects. Poet and nationalist Ambikagiri Raichoudhury used Kamrupi in his works to great extent.