INTRODUCTION: Guided self-help based on psychodynamic principles (IPDT) has shown efficacy for adolescent depression and non-inferiority to ICBT. Two randomized controlled trials have shown promising results for IPDT in Social Anxiety Disorder (SAD). There is little known regarding predictors of outcome in IPDT. This presentation focuses on predictors of  outcome in IPDT for SAD. METHODS: In this randomized controlled trial (n = 181), participants were randomized to guided IPDT, unguided IPDT or waitlist. Participants were recruited nationwide in Sweden. Eligible participants were ≥ 18 years old, scoring ≥ 60 on the Liebowitz Social Anxiety Scale self-report (LSAS-SR) without meeting any exclusion criteria. The IPDT intervention comprised eight self-help modules based on affect-focused dynamic therapy, delivered over 8 weeks on a secure online platform. The primary outcome was SAD symptom severity measured weekly by the LSAS-SR. Baseline measures such as comorbid symptoms of depression, anxiety, self-compassion, emotion regulation and defensive functioning were all tested as potential predictors of outcome. RESULTS: Preliminary findings will be presented at the conference. DISCUSSION: This is the second predictor study on IPDT and the first on IPDT for SAD. Finding predictors of outcome could lead to improved outcomes in terms of matching patients to the most effective treatment given their baseline characteristics.