Abstract: While the principle of the “self-determination of peoples” is a widely shared norm in international relations, its content, justification, and scope are under dispute. This article focuses on the content issue and proposes a transgenerational conception of collective self-determination as a novel idea for international morality. Crucially, it suggests past, living, and future members of the people as contemporaneous co-participants in self-rule. I take the political approach to collective self-determination proposed by Margaret Moore and Anna Stilz as my starting point. I argue that the best version of the political approach remains temporally weightless, which raises important normative questions. I then argue that the challenge of temporal weightlessness can be offset not by rejecting the political approach but by conceiving of past and future members as part of the politically construed people. I then discuss what it means for past, living, and future members to be co-participants of collective self-rule.