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A symptom-based subgroup taxonomy for obsessive–compulsive disorder (OCD) was evaluated and refined. The Yale-Brown Obsessive–Compulsive Scale symptom checklist was scored and cluster analysis was conducted with a sample of OCD patients (N=114). Results were compared to Calamari et al.’s (Behaviour Research and Therapy 37 (1999) 113) five subgroup model. Rules for determining the number of subgroups supported a more complex model. In between sample comparisons, a stable contamination subgroup was found in both a five and seven subgroup taxonomy. Between sample stability was not as strong for Harming, Obsessionals, Symmetry, and Certainty subgroups. Hoarding, as a distinctive subgroup, was unstable in separate samples. When the Calamari et al. sample and the present sample were combined (N=220), we found a reliable Hoarding subgroup. More interpretable and stable …