Abstract: B orderline Personality Disorder (BPD) is described as an unstable sense of self, emotions, and relationships. The need for BPD Arabic assessment has emerged to bridge the gap of the Arab population with BPD. The Mclean Screening Instrument for BPD (MSI-BPD) has been translated into several languages; however, the psychometric qualities of the MSI-BPD were not investigated among Arabs. This paper mainly aims to report the validity and reliability of the Arabic version of MSI-BPD. Method: the Arabic version of the MSI-BPD was back-translated. The sample was n= 829 aged from 18 to 24.  This study conducted Confirmatory Factor Analysis, t-test, and  Cronbach's Alpha Reliability Coefficient, descriptive statistic, using SPSS. Result: the overall analysis indicated good validity and reliability (CFI = .97, a = .88). 11% of the participants have met the criteria of BPD, however they have never been diagnosed. Also, women reported a higher rate of BPD symptoms, and the diagnosed populations scored higher compared to the non-diagnosed. Conclusion: results suggested that MSI-BPD could be utilized to screen the population in clinical settings, urgent care centers, and hospitals in Saudi Arabia.