This study examined the relationships of vocational interests and self-efficacy expectations, or confidence, to personality, as measured by the Personal Styles scales of the Strong Interest Inventory. The study also examined the extent to which confidence and personality measures contributed incrementally to the prediction of occupational group membership. In a sample of 1,103 adults employed in 21 occupations representing the complete Holland hexagon, confidence-personality relationships were very similar to interest-personality relationships found in previous research. Discriminant analyses indicated that both personality and confidence contributed incrementally to the prediction of occupational group membership, although the most powerful single predictor set was 14 basic confidence dimensions (e.g., science, public speaking, and writing) extracted through principal components analysis. There were substantial differences across the 21 occupations in their predictability and in the extent to which they were differentiated by personality variables versus confidence dimensions. Implications for further work on the intersections of vocational interests, confidence, and personality are discussed.