Eleven species of Fissidens are recognized in the Hawaiian bryoflora. Fissidens hawaiicus and F. oahuensis are considered synonymous with the cosmopolitan F. bryoides, both F. baldwinii and F. bishopii with F. elegans, and F. mauiensis with F. pacificus. Fissidens taxifolius is considered an element of the flora. Fissidens intermedius is reported in the flora for the first time, while F. bryoides and F. elegans are reported for the first time as such. A key, descriptions, illustrations and maps indicating local distributions are provided for all species.