Subjective vitality is an indicator of eudaimonic well-being that refers to the feeling of being alive and full of energy. According to Self-Determination Theory (SDT), awareness of what is truly occurring in the present is conducive to subjective vitality. The current study examined the construct validity of the Subjective Vitality Scale and its relation to sociodemographic variables and Experiential Self-Knowledge (ESK), a theoretically relevant awareness construct, in the Lebanese cultural context. A convenient sample of 301 Lebanese adults residing in the Greater Beirut Area completed the Arabic translations of the 6-item Subjective Vitality Scale (SVS) and the 13-item ESK Scale. Exploratory and confirmatory factor analyses supported a unidimensional factor structure for the Arabic SVS. Multiple-group confirmatory factor analyses also provided evidence of configural, metric, structural, and scalar invariance across sex. With respect to sociodemographic variables, sex was the only significant correlate and predictor of subjective vitality, with males reporting greater levels of subjective vitality than females. Consistent with Self-Determination Theory (SDT), awareness as assessed by the ESK Scale was found to be a positive correlate and predictor of subjective vitality such that those who scored higher on experiential self-knowledge also reported greater levels of subjective vitality. These findings provide preliminary support for the construct validity of the Arabic translation of the SVS in the Lebanese context and highlight the potential role of awareness in eudaimonic well-being.