Tinnitus is a common otological problem that is often resistant to surgical or medical interventions. In common with chronic pain, cognitive-behavioral treatment has been found to alleviate the distress and improve the functioning of tinnitus patients. Recently, a self-help treatment has been developed for use via the Internet. In this article, we describe the self-help program and apply it to a middle-aged woman with tinnitus. We report the case formulation, which was done in a structured interview, and the treatment interactions, which were conducted via e-mail. The self-help program was presented on Web pages, and weekly diaries were submitted to follow progress and give feedback. The treatment was successful with reductions of tinnitus-related annoyance and anxious and depressive mood. Implications for Internet administration of self-help treatment are discussed. © 2003 Wiley Periodicals, Inc. J Clin Psychol/In Session.