The present study reports on the first investigation of the generalizability of the psychometric properties of the Student Subjective Wellbeing Questionnaire (SSWQ) beyond the original development and replication studies. Previous studies tested an English version of the SSWQ with urban, mostly Black/African American, low socioeconomic status, middle school age youth living in the southern region of the United States, while the current study tested a Turkish version of the measure with high school age youth of varying economic statuses living in an urban city in Turkey (N = 548). Results show the Turkish version of the SSWQ has a sound latent measurement model and that it demonstrates convergent validity with several criterion variables that represent distinct yet related school-specific wellbeing constructs. Findings from multigroup measurement invariance analyses, comparing the Turkish sample with the U.S. replication sample, indicate positive configural invariance yet do not support scalar invariance or full metric invariance. The limitations and implications of these results for future research and practice are discussed.