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Purpose: The objective of this study was to demonstrate the effect of vocal audiovisual biofeedback in the treatment of puberphonia., Method: This is a report of a single subject research study encompassing intervention and observation of results, involving three phases: baseline, treatment, and follow-up. Therefore, this study applied an A-B case study experimental design with follow-up for observation of treatment outcomes. Self-reported complementary data regarding feelings of voice usage included comparisons between pre and post intervention scores of the Voice Handicap Index (VHI) survey., Results: In this study, acoustic voice parameters measured revealed changes in vocal performance in the desired direction, as demonstrated by visual inspection and estimation of effect size of the data; changes were maintained during the follow-up phase. Examination of VHI results suggested post intervention improvement in functional and psychosocial aspects related to voice use., Conclusions: Based on the results of this study, audiovisual feedback approaches are effective in the treatment of puberphonia. Results will apply to future considerations in the application of technology support for treatment of puberphonia and other voice related disorders., (Copyright © 2015 Elsevier Ireland Ltd. All rights reserved.)