Objective – Cognitive Behavioural Therapy for the treatment of Social Phobia has proved effective through several controlled trials and meta-analyses. In spite of this the CBT has not spread in clinical field yet. Therefore our aim was to verify the effectiveness of the CBT in a public mental health service and to compare our results with those described by experimental research. Design and setting – Partecipants were 11 public mental health center clients, with a primary diagnosis of Social Phobia (according to DSM-IV criteria). The transportability of CBT to a common clinical setting was examined comparing treatment outcome data, at the end of the treatment and at a six months follow up, with results described in controlled efficacy studies. We employed self completion rating scales relating to both general health conditions and life satisfaction (SF36) and trend of symptoms (LSPS). Moreover we recorded the Clinical Global Impression (CGI) and Patient's Global Impression (PGI). Results – Despite differences in setting, clients and treatment providers, both the magnitude of change from pre treatment and maintenance of change at a six months follow up were comparable with the parallele findings in the efficacy studies. Conclusions –. The results attest the effectiveness of CBT even in a public mental health center setting so, in consideration of the fact that social phobia is a very common disease and involve high degree of severity, chronicity and disability, we hope that this effectual and relatively cheap therapy will be routinely applied in public mental health services.