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Objective: The aim of this study was to test the validity and reliability of General Causality Orientations Scale (GCOS) for a Turkish sample, which can evaluate the source of the behavior and internal processes besides the preference for the perception of external pressure and coercion. Methods: Firstly, GCOS was translated in Turkish with participation of five expert judges. Resulting scale were administered to a college sample of 363 participants (239 females, 66.6%; 124 males, 33.4%). A subsample of 51 participants were retest after three weeks for test retest reliability. Results: Based on item analysis, Pearsons correlations, and factor analysis, Turkish form of the GCOS was resulted 40 items with two of them are reversed although original form was 51 items. The internal validity of GCOS is 0.81, and correlations with the other scales (Locus of Control Scale, Brief Symptom Inventory) were between 0.10-0.39, which are low but indicating significant conceptual relations. Test-retest reliability coefficients were between 0.71-0.86. Conclusion: Sufficient reliability and validity indexes and suitability of GCOS in Turkish college sample were discussed. [Anadolu Psikiyatri Derg 2016; 17(0.100): 100-107]