This study investigated the relation of Type A behavior dimensions and measures of optimism and pessimism. The sample of 322 undergraduate students were 80 men and 242 women at Kuwait University. Analysis showed that five dimensions of Type A behavior, accuracy and persistence, speed and time pressure, desire for promotion, seriousness and organization, and workaholism were positively correlated with optimism, while aggression was negatively correlated with optimism and positively correlated with pessimism. The multiple regression analysis indicated that speed and time pressure and desire for promotion contributed significantly to the prediction of optimism, while aggression predicted pessimism more than any other dimension of Type A behavior