This study explored the extent to which perceived organizational support, work motivation, and organizational commitment predict individual differences in job performance workers. We expected positive relationship between POS, WM, and OC, and their substantial contribution in predicting job performance. 231 male skilled workers (28-45 yrs.) from different units of National Fertilizer Ltd. India participated in the study and completed Perceived Organizational Support Questionnaire, Employees Motivation Schedule, and Occupational Commitment Questionnaire. The job performance of the participants was rated by their immediate superiors through Performance Rating Scale. The findings supported the hypotheses of modest level positive correlation between POS, OC, and WM and their significant contribution in determining job performance. Among all the three classes of predictor variables, POS showed highest correlation with job performance followed by WM measure monetary gains, and affective commitment. Continuance commitment, need for goal achievement and competition, and non financial rewards have shown modest level association with performance. The stepwise regression identified a set of five variables which predicted best the job performance. In close agreement with social exchange views, perceived organizational support appeared to be most potent predictor of job performance. Two components of work motivation, i.e., need for monetary gains and goal achievement and competition were found contributing significantly to the prediction of job performance. It points to the importance of extrinsic sources of motivation for lowly paid industrial workers but at the same time they value intrinsic sources also. Among three components of OC, affective and continuance commitments were the better predictors of JP.