P urpose of this study was to analyze the effect of transformational leadershipto affective organizational commitment through Psychological empowerment. Dataobtained directly by distributing questionnaires to 120 respondents in PT. Pertaminalubricants. The sampling technique in this research is survey.This research using SEM analysis tool (Structural Equation Model). The resultof descriptive statistic transformational leadership has an average value of 3,870,Descriptive statistic Psychological empowerment has an average value of 3.868, AndDescriptive statistic affective organizational commitment has an average value of3.863. The result of positive effect from transformational leadership to Psychologicalempowerment shows that there is positive effect that can be see through p-value0,077 > 0,05. The result of positive effect from Psychological empowerment toaffective organizational commitment shows that there is positive effect that can besee through p-value 0,002 < 0,05. The result of positive effect from transformationalleadership to affective organizational commitment shows that there is positive effectthat can be see through p-value 0,027 < 0,05. The result of positive effect fromtransformational leadership to Psychological empowerment through byPsychological empowerment shows that there is positive effect that can be seethrough p-value 0,000 < 0,05.