Reports of nephritis in chimpanzees are relatively rare, compared with those in other nonhuman primates. McClure and Guilloud reported chronic pyelonephritis in a 35-year-old female chimpanzee; Schmidt and Butler reported glomerulonephritis in an 11-year-old female chimpanzee, and Kim reported on a 12-year-old male with subacute interstitial nephritis in a chimpanzee after the animal had recurrent hemolysis due to phenolic intoxication. The present report deals with supprative nephritis caused by Pseudomonas resulting in renal failure in a chimpanzee.