Renal coccidiosis was diagnosed in 3 of 45 mallards (Anas platyrhynchos) and 2 of 7 pintails (Anas acuta) collected in Saskatchewan. Oocysts recovered from two of these birds were similar to, but larger than, those of Eimeria truncata. Pathologic changes associated with the coccidial infection as well as that seen in association with other renal parasites are described.