The three were convicted of “corruption on earth” and “assisting in armed rebellion,” charges that carry the death penalty under Iran’s Islamic law.
The judiciary described them as key coordinators in the planning and logistics of the attacks, which killed a total of 15 people, according to official figures.
Five others received prison terms ranging from five to 25 years. Two were identified as members of the Islamic State militant group, also known as Daesh.
The shrine, a prominent religious and tourist site, was targeted twice in less than a year. Iranian authorities previously executed two people connected to the first attack in October 2022.
In the second attack in August 2023, the main perpetrator was identified as Rahmatullah Nowruzov, a Tajik national. Authorities arrested multiple foreign nationals in connection with that incident.
Iranian officials have attributed the attacks to extremist groups.