Arman Abdolali, now 25, is due to be executed on Wednesday after he was convicted of killing his girlfriend, rights group Amnesty International reported.
Iran has signed an international agreement banning the death penalty for people who committed crimes while under the age of 18.
Iran executes more people each year than any other nation except China. Iran Human Rights said at least 64 juvenile offenders have been executed in the country over the past 10 years, with at least four executed in 2020.
