Objective: This research explores the implications of father absence due to divorce on young adults' well‐being and romantic relationships. Background: Studies have demonstrated the negative implications of father absence, a common consequence of divorce, on children's development. However, previous research has not systematically compared complete versus partial father absence. Method: Young adults who, as children, experienced complete (n = 38) or partial (n = 41) father absence were compared with 40 participants in a father‐presence control group. Results: Compared with those in the control group, young adults in the partial father‐absence group reported higher psychopathology and maternal overprotection, and lower maternal care, romantic intimacy, commitment, and passion. Under elevated maternal care, the partial‐absence group reported lower dyadic adjustment and consolidated sense of identity. Participants in the complete‐absence group reported higher self‐criticism and maternal overprotection and lower maternal care than controls. Conclusion: Partial father absence might have particularly pernicious consequences for young adults' well‐being. Implications: Clinical and public policy implications are discussed. [ABSTRACT FROM AUTHOR]