Objective: The aim of this research was to examine validity and reliability of theTurkish version of the Bergen Insomnia Scale (BIS) in adolescents.Methods: The scale was applied to a total of 1293 adolescents and 110 studentswere retested four weeks later. While content and construct validity analyses werecarried out for validity of the scale, internal consistency and test-retest analysis wasused for the reliability. Content validity of the scale was evaluated by opinions from10 experts, construct validity via confirmatory factor analysis, internal consistency viaCronbach’s alpha reliability coefficient, test-retest results via Pearson’s correlationanalysis.Results: Cronbach’s alpha reliability coefficient of Bergen Insomnia Scale was foundas 0.72. Item – total correlations were ≥0.36 and test-retest correlation was 0.74.Content validity index was found to be 99%, there was agreement between experts,the items in the scale were suitable for our culture, and it represented the structurewhich was intended to be measured. Confirmatory factor analysis confirmed thestructure of BIS consisting of 6 questions and 2 factors.Conclusion: Bergen insomnia scale was found to be reliable and valid. The scalecan be used to measure insomnia in Turkish adolescents.