Many researchers have used the terms 'temperament' and 'personality' interchangeably when describing parents' behavioral styles. Although individual relationships among parents' temperament and personality, parenting behaviors, other parent characteristics, and young children's outcomes have been documented in the literature, parents' temperament and personality have not been examined collectively in conjunction with parenting and child outcome variables. As part of this study, 214 culturally diverse mothers with young children who ranged in age from 2- to 6-years rated their own temperament and personality, their parenting characteristics, and their young child's functioning (i.e., temperament and emotional and behavioral functioning). When examining mothers' temperament and personality together, factor analyses revealed a three-factor solution (i.e., General Life Approach, Rhythmicity, and Sticktoitiveness) and suggested that temperament and personality generally were separate but related constructs. Hierarchical and mediation regression analyses suggested the importance of examining both temperament and personality in the context of parenting behaviors and the outcomes experienced by young children. Overall, these findings suggested that mothers' temperament and personality play a significant role in parenting young children and optimizing young child outcomes. These findings are particularly helpful for professionals working with families experiencing difficulties dealing with their young child's difficult temperament styles as well as difficult emotional and behavioral functioning.