Do differences in how people think about their own futures predict responsibility for the collective future welfare of humanity? Across a reanalysis of existing data, four primary studies, six supplemental studies, and an internal meta-analysis (NTotal = 11,261 US participants), we investigate how individual differences in self-oriented prospection relate to intergenerational responsibility, elucidating theoretical and practical implications for the psychologies of future-thinking and intergenerational ethics alike. We consistently observe an association between Future Self-Continuity (FSC; variation in the amount of perceived overlap between people's present and future self-concept) and Consideration of Future Consequences (CFC; individual differences in tendencies to consider how present actions impact one's own future life outcomes) with increased feelings of responsibility for, perceived efficacy to impact, and identification with future generations. Drawing upon insights from behavioral economics, Construal Level Theory, and research on moral expansiveness, our results begin to reconcile the literatures studying the adaptive functions of self-oriented prospection with disparate lines of inquiry into the individual differences that mitigate tendencies to prioritize present over future generations. Moreover, the present findings open new avenues for further research to explore potential practical benefits of self-oriented prospection for bolstering efforts to improve long-term collective welfare.