Six species of colubrid snakes from California were examined for helminths: Arizona elegans, Chionactis occipitalis, Masticophis flagellum, Masticophis lateralis, Phyllorhynchus decurtatus and Rhinocheilus lecontei. One species of Trematoda, Paralechriorchis syntomentera, two species of Cestoda, Oochoristica osheroffi and Mesocestoides sp. (tetrathyridia), four species of Nematoda, Physaloptera abjecta, Spauligodon goldbergi, Thubunaea iguanae, and Physaloptera sp. (larvae) and one species of Acanthocephala represented by cystacanths (Oligacanthorhynchidae), were found. Nine new host records are reported.