Three new distributional records and a new host record are reported for protozoan and nematode parasites of the eastern narrowmouth toad, Gastrophryne carolinensis, from northwestern Louisiana and northeastern Texas, U.S.A. Nine of 24 (38%) G. carolinensis harbored 1 or more of 3 parasite species, including 1 (4%) with the myxozoan, Myxidium serotinum, 9 (38%) with the opalinid, Protoopalina allisteri, and 4 (14%) with the nematode, Cosmocercoides variabilis. A new host record is documented for M. serotinum, new geographic records for Louisiana and Texas are reported for P. allisteri, and a new geographic record for Louisiana is reported for C. variabilis.