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Abstract: The Penn State Worry Questionnaire (PSWQ) is a widely used self report scale to assess pathological worry. Several studies have shown that the paper-and-pencil version of the PSWQ shows satisfactory psychometric properties. Yet, it is unknown whether the PSWQ is suited to be administered on Internet. As the amount of assessments conducted online is vastly increasing, we examined the factor structure, predictive validity and reliability of the online version of the PSWQ in a large community sample (N =1025). Confirmatory factor analyses demonstrated that the best fit to the data was provided by a one factor model wherein the reverse-worded items also loaded on a separate method factor. In a second part of the study a self-selected subsample of the total sample (n =189) kept a log of the frequency and duration of worry episodes for six consecutive days. Worry frequency and worry duration were both predicted by the PSWQ, thereby lending support to its predictive validity. These findings provide preliminary evidence that the online version of the PSWQ possesses psychometric properties that are similar to the paper-and-pencil version. [Copyright &y& Elsevier]