The history of nomenclature of non-siphonophoran Hydrozoa is reviewed, showing the existence of many available names. The name Hydroidomedusae CLAUS 1877 is here chosen has appropriater for non-siphonophoran hydrozoans. Different names for the orders are also available, according to the considered stage (hydroid or medusae). To avoid compound names, the medusa-based names are chosen as valid because the medusa is considered to represent the adult stage. The orders of Hydroidomedusae, thus are: Actinulidae, Anthomedusae, Laingiomedusae, Leptomedusae, Limnomedusae, Narcomedusae, Trachymedusae.