Two studies are reported that investigate the relationships among commitment and motivation mindsets and their contribution to work outcomes. Study 1 involved 487 nurses from a hospital in the center of Italy. Results showed that commitment's facets were related to parallel dimensions of work motivation. Study 2 involved 593 nurses from a hospital in the north of Italy. Analyses indicated that commitment and motivation were important antecedents of working attitudes and behaviors. Moreover, self-determined motivation played a critical mediating role in positive behaviors. Findings are discussed in terms of their practical implications for organizations and employees.