Oral history interviews with youth anti-nuclear activists conducted in Japan and Canada. Participants were recruited through snowball sampling when they met the following inclusion criteria: (a) affiliation with organisations partnering with the International Campaign to Abolish Nuclear Weapons (ICAN) or the United Nations Office for Disarmament Affairs (UNODA); (b) self-identification as part of a youth-led initiative; and (c) physical presence in Japan or Canada at the time of the interview.