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One hundred and eleven individuals completed the NEO Five Factor Inventory along with three measures of subjective well-being, the Oxford Happiness Inventory, the Depression–Happiness Scale, and the Satisfaction With Life Scale. Regression analysis showed that although Extraversion and Neuroticism best predicted scores on the Oxford Happiness Inventory, it was Neuroticism and Conscientiousness that best predicted scores on the Satisfaction with Life Scale. These results provide further evidence that Neuroticism and Extraversion are dimensions of personality related to subjective well-being. However, the results also suggest that Conscientiousness is an additional dimension of personality relevant to understanding subjective well-being.