The problem of the correct position of the Conocepbaloideae, a subfamily of the Moraceae in Engler's system, but transferred to the Urticaceae by Corner (1962), can be satisfactorily solved by assigning the rank of family to this taxon, to be named Cecropiaceae. Diagnoses of and a key to the six genera constituting this family (Cecropia, Coussapoa, Musanga, Myrianthus, Poikilospermum, and Pourouma) are given. The classification of the Urticales and the relationship between the Cecropiaceae and both Moraceae and Urticaceae are discussed. A key to the families of the Urticales is given.