The Gomphidiaceae are a family of mushroom-forming fungi in the order Boletales. Unlike other boletes, all members of Gomphidiaceae (except for Gomphogaster) are agarics, having gills instead of pores. Member genera include Chroogomphus, Cystogomphus, Gomphidius and Gomphogaster, the last being a monotypic genus (i.e. with a single species) that may be incorporated into Gomphidius in the future after molecular assessment. The similarly named genus Gomphus is unrelated to this family. Another genus Brauniellula has since been sunk into Chroogomphus.