We report new localities in Nicaragua for thirteen poorly known snake species that were collected for the second (Dipsas articulata and Ungaliophis panamensis), third (Coniophanes bipunctatus, Lachesis stenophrys, Sibon annulatus, Sibon dimidiatus, Tantilla reticulata, and Tropidodipsas sartorii), fourth (Atropoides mexicanus, Enuliophis sclateri, Imantodes inornatus, and Nothopsis rugosus), and fifth (Corallus annulatus) times in the country. We also provide distributional range extensions for all viper species known to occur in Nicaragua (Agkistrodon howardgloydi, Atropoides mexicanus, Bothriechis schlegelii, Bothrops asper, Crotalus simus, Lachesis stenophrys, Porthidium nasutum, and Porthidium ophryomegas), one coral snake (Micrurus alleni), and four mildly venomous snakes (Conophis lineatus, Leptodrymus pulcherrimus, Leptophis ahaetulla, and Xenodon rabdocephalus), and the first records for four snake species (Imantodes gemmistratus, Lachesis stenophrys, Pseudoelaphe flavirufa, and Tantilla armillata) from within the Nicaraguan national protected areas system.