The primary aim of the pilot study is to investigate the feasibility of conducting a randomized controlled trial (RCT) comparing the effects of transdiagnostic and diagnosis-specific cognitive-behavioral therapy (CBT) for patients with anxiety disorders in routine psychiatric outpatient care in Stockholm, Sweden. It is hypothesized that an RCT is feasible in terms of recruitment, retention, therapist competence and adherence to treatments, and that the treatments are well received by participants.