This study sought to validate the Short Grit Scale (Grit-S), an instrument that measures perseverance and passion for long-term goals, among Chinese high school students. Confirmatory factor analyses revealed that the scale retains the two-factor structure of the original scale. The scale demonstrated satisfactory internal consistency and test–retest reliability. Evidence for construct validity was found in relation to the Big Five personality traits, self-control, and IQ. Evidence for criterion validity was found via the observation that grit explained unique variance in academic performance. Together, the Grit-S is a sound measure of grit among Chinese adolescents.