Background Fathers can have a critical role to play in supporting the well-being of youth. However, little is known about how fathers perceive youth well-being. The Five Cs model of positive youth development was the theoretical starting point of this study, in part due to this framework's focus on the importance of bi-directional, person-context relations (Geldhof et al., in: Molenaar, Lerner, Newell (eds) Handbook of developmental systems theory and methodology, Guilford Press, New York, 2014). Questions posed in the present study were derived from the 4-H study of positive youth development (Lerner et al. in J Early Adolesc 25(1):17-71, 2005), which is rooted in the Five Cs model. Objective The present study explored themes and patterns of meaning in descriptive information from fathers about youth well-being. Method An inductive-deductive approach to thematic analysis was used to examine responses to open-ended survey questions from 201 Swedish fathers regarding youth well-being. Results Based on the fathers' reports four themes were identified: cognitive well-being, emotional and psychological well-being, physical well-being, and social well-being. While some sub-components of these themes have been identified in earlier literature, new subcomponents were also found in each domain of youth well-being (i.e., cognitive, emotional/psychological, physical, social). Conclusions These findings suggest that the understanding of youth well-being is contextual and multi-faceted, and that fathers' perceptions can be important to consider in future research as they may further our insight into the rich and nuanced characteristics of positive youth development in diverse contexts.