The efficacy of Habit Reversal Training (HRT) in a group format for the treatment of trichotillomania was investigated. Original HRT procedures described by Azrin and Nunn (1973) were modified for use in a group context. Five patients were treated over a 6-week period. Treatment included self-monitoring, awareness training, competing response training, and homework assignments. Post-treatment data indicated decreases in measures of global severity of symptoms, severity of thoughts about hair-pulling, and severity of hair-pulling behavior, relative to pretreatment measures. Three of the 5 patients maintained improvement at 1-month follow-up, and 2 patients maintained treatment gains at 6 months. Follow-up scores for all patients continued to be lower than pretreatment scores. These case illustrations replicate and extend prior data, lending support to the viability of HRT in a group format as a meaningful approach to treating trichotillomania.