The relationships among the major lineages of frogs are summarized and an un- ranked, phylogenetic taxonomy of Anura is proposed. The names of taxa are defined according to phylogenetic principles. Several currently recognized taxa, such as "Archaeobatrachia", "Discoglos- soidea", "Leiopelmatidae", and "Discoglossidae" are paraphyletic, and the names are abandoned or redefined such that the associated taxa are monophyletic. Node-based names are proposed for several unnamed but previously recognized taxa: Leiopelmatanura, Bombinanura, Discoglossanura, and Pipanura. Pipanura is the node-based name for Mesobatrachia and Neobatrachia. Mesobatrachia comprises Pelobatoidea and Pipoidea. Pelodytidae is defined as a stem-based name to accommodate certain fossil pelobatoid taxa. Rhinophrynus, Rhinophrynidae, and Pipimorpha are defined as stem- based names that accommodate fossils within Pipoidea. tEopelobatinae* is a metataxon. Relationships within Neobatrachia are largely unresolved. There is no evidence for the monophyly of "Myobatrachidae", but Limnodynastinae and Myobatrachinae are each monophyletic. Sooglos- sidae appears most closely related to Myobatrachinae. "Leptodactylidae" and "Ranidae" are non- monophyletic groups. Scaphiophryninae* and Arthroleptidae* are metataxa. The name Scoptanura is used for the subclade of Microhylidae that excludes scaphiophrynines. Dendrobatidae, a taxon of controversial status, is placed within Ranoidea.