The Online Bibliography of Chadic and Hausa Linguistics (OBCHL), henceforth the ‘biblio’, is an updated, expanded, and corrected edition of the bibliography published some fifteen years ago by Rüdiger Köppe Verlag (Newman 1996). That biblio was built on valuable earlier works including Hair (1967), Newman (1971), Baldi (1977), R. M. Newman (1979), Awde (1988), and Barreteau (1993). The ensuing years have witnessed an outpouring of new publications on Chadic and Hausa, written by scholars from around the globe, thereby creating the need for a new, up-to-date bibliography. Data gathered for this online edition, which was compiled using EndNote, an excellent and easy to use bibliographic database program, have come from my own library and internet searches as well as from a variety of published sources. Particularly valuable have been the reviews of the earlier bibliography, most notably the detailed review article by Baldi (1997), the Hausa and Chadic entries in the annual Bibliographie Linguistique, compiled over the past dozen years by Dr. Joe McIntyre, and the very useful list of publications found regularly in Méga-Tchad. A subsequent third edition of this work can be found at http://hdl.handle.net/2022/20576.