Integration of morphological and molecular approaches to species delineation has become an essential part of digenean trematode taxonomy, particularly when delimiting cryptic species. Here, we use an integrated approach to distinguish and describe two morphologically cryptic species ofHysterolecithaLinton, 1910 (Trematoda: Lecithasteridae) from fishes of Moreton Bay, Queensland, Australia. Morphological analyses ofHysterolecithaspecimens from six fish species demonstrated a complete overlap in morphometric data with no reliable differences in their gross morphological characters that suggested the presence of more than one species. Distinctions in ITS2 rDNA andcox1 mtDNA sequence data for corresponding specimens suggested the presence of two forms. A principal component analysis on an imputed dataset showed clear separation between the two forms. These two forms are partially separated on the basis of their host’s identity. Therefore, we describe two morphologically cryptic species:Hysterolecitha melaen. sp.from three species ofAbudefdufForsskål and one species ofParmaGünther (Pomacentridae), with the Bengal sergeant,Abudefduf bengalensis(Bloch), as the type-host; andHysterolecitha phisonin. sp.from species of Pomacentridae (includingA. bengalensis), Pomatomidae and Siganidae, with the black rabbitfish,Siganus fuscescens(Houttuyn), as the type-host.