Research and intervention efforts for autistic people have disproportionately focused on negative mental health. This has resulted in a shortage of interventions addressing the promotion of positive emotional (hedonic) and psychological (eudaimonic) states. Therapeutic photography, which refers to self-initiated photo-taking paired with mindful reflections of the photographs, has the potential to provide an accessible and scalable approach to promote positive mental health for autistic people. This study employed a mixed-methods design to investigate the development and feasibility of a novel therapeutic photography intervention intended to promote hedonic and eudaimonic well-being among autistic youth. Forty-one autistic youth between 16 and 25 years of age were recruited. Findings indicated that therapeutic photography was a feasible intervention in terms of demand, implementation, acceptability, and practicality. There was also preliminary evidence suggesting that therapeutic photography may be a promising intervention for the promotion of different aspects of hedonic and eudaimonic well-being. Suggestions for future intervention adaptations to better address the needs of autistic youth are also featured.