From 2015 to 2017 we sampled snakes in most regions of the Republic of Chad, Central Africa. A total of 1,512 snakes belonging to 66 species were collected. Based on a full account of this collection, supplemented with additional museum specimens and reliable literature reports, we present an annotated checklist of the 80 snake species currently known from Chad, including 28 species that we added to the snake fauna of this country: Letheobia weidholzi, Myriopholis occipitalis, Tricheilostoma sundewalli, Crotaphopeltis hippocrepis, Dasypeltis sahelensis, Natriciteres olivacea, Platyceps florulentus, Spalerosophis diadema cliffordi, Telescopus tripolitanus, Atractaspis dahomeyensis, Atractaspis micropholis, Aparallactus lunulatus nigrocollaris, Boaedon longilineatus, Boaedon paralineatus, Boaedon perisilvestris, Boaedon subflavus, Lycophidion aff. capense, Malpolon moilensis, Micrelaps vaillanti, Prosymna ambigua, Prosymna greigerti, Psammophis afroccidentalis, Psammophis elegans, Psammophis mossambicus, Psammophis sudanensis, Rhamphiophis rostratus, Naja savannula and Echis romani. Collecting localities for all specimens are provided and some taxonomical and biogeographical issues are discussed.
