Acute renal failure has been a rare, uniformly fatal complication of infection with Francisella tularensis. The literature suggests that either acute tubular necrosis, interstitial nephritis, or glomerulonephritis may be responsible for this syndrome. We have described a patient with tularemia who had nonoliguric acute renal failure probably due to interstitial nephritis and who recovered slowly but spontaneously during antimicrobial therapy with doxycycline.