Nomenclator may refer to:
Nomenclator omnium rerum propria nomina variis linguis explicata indicans, 16th century book written by Hadrianus Junius Nomenclator, in cryptography, a kind of substitution cypher Nomenclator (slave), a slave in ancient Rome who reminded their masters of the names and pertinent information of those they met on political campaigns Nomenclator, in biology, a publication listing taxonomic information akin to a taxonomic database Nomenclator of Leiden University Library, the first printed institutional library catalog
See also Nomenclature, a system of names or terms