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Cognitive–behavioral therapy (CBT) for psychosis is recommended in many national guidelines, but dissemination into routine health care remains poor. This study tests whether an 8-week, CBT-oriented, Internet-based intervention (IBI) for people with psychosis is feasible, effective, and safe compared to care as usual. A sample of 101 people diagnosed with schizophrenia-spectrum disorders (age: M= 40.0, SD= 9.60; sex: 58% female) was randomly assigned to either an IBI for psychosis or a wait-list control condition. The primary outcome was a composite score of the positive factor of the Positive and Negative Syndrome Scale, the Launay Slade Hallucination Scale, and the paranoia checklist (clinicaltrials. gov, NCT02974400). The composite score of psychotic symptom severity decreased more in the IBI condition than in the wait-list condition, reflected in the significant interaction of …