Lower Carboniferous (Viséan-?early Namurian) conodonts, and some of their variably complete reconstructed apparatuses, are described from cyclic marine carbonates, associated with evaporites and mud rocks, of the Windsor Group, Magdalen Islands, Quebec, Canada. The conodont fauna includes Clydagnathus windsorensis, Cavusgnathus unicornis, Taphrognathus transatlanticus, Hindeodus cristula, Hindeodus? scitulus, Vogelgnathus campbelli, Ozarkodina laevipostica, Mestognathus bipluti, Mestognathus spp., Spathognathodus? n. sp. A, and Apatognathus spp.