This is a comprehensive grammar of the Hills Karbi variety spoken predominantly in the Karbi Anglong districts. Karbi belongs to the Trans-Himalayan (Tibeto-Burman) family but its exact phylogenetic status has remained unclear. By providing a diachronically-oriented functional analysis of all structural levels of Karbi, this grammar offers a reference work that provides a thorough account of this language. The data in this grammar come from fieldwork that was primarily carried out in the district capital of Diphu although the corpus includes recordings of speakers from all over the two Karbi Anglong districts. This corpus is freely available both as fully glossed text in Himalayan Linguistics (Konnerth and Tisso 2018) and as original media files in ELAR (SOAS University of London). Now also including a glossary, this grammar is a thoroughly revised version of the 2014 dissertation of the author, which won the 2015 Pāṇini Award of the Association for Linguistic Typology (ALT). In this revised version, a few new sections have been added and numerous other sections have been thoroughly updated.