Here is the letter’s text:
Mr. Antonio Guterres, Secretary General of the United Nations
We, the Iranian artists, along with the veterans and survivors of chemical warfare of the Iran-Iraq war (1980-1988), by signing this letter, call upon you to do your best to stop the ongoing atrocities against the under siege civilians in Gaza including women and children.
Sir, the position you hold, whether you like it or not, represents the historical conscience of today’s humanity, and its performance will be judged by future generations. Try to stop the war for the sake of humanity.
Sincerely, 
Tehran Peace Museum – Iran’s House of Cinema
Names of signatories in alphabetical order:
Amir Esbati, Habib Ahmad Zadeh, Hafez Ahmadi, Mahmoud Arbabi, Bahman Ardalan, Homayoun As’adian, Abdollah Esfandiari, Habib Esmaeili, Mahdi Aslani, Mehrdad Afrasiani, Majid Altaei, Mohsen Amir-Yousefi, Masoud Amini Tirani, Majid Entezami, Mohammad Afarideh, Mohammad Bahrani, Maryam Boubani, Hedayatollah Behboudi, Behrouz Bayat, Hossein Pakdel, Asghar Pour-Hajarian, Hadi Pouyan, Kamal Tabrizi, Siroos Taslemi, Mohsen Tanabandeh, Farhad Tohidi, Hanieh Tavassoli, Batoul Tavakkoli, Amirhossein Tavakkolian, Amin Jafari, Mahdi Jafari, Masoud Jafari Jozani, Rambod Javan, Parviz Chabahari, Afsaneh Chehre-Azad, Leila Hatami, Hadi Hejazifar, Malek Hadpour Seraj, Hasan Hasan-Tabar, Alireza Hosseini, Shahriar Khateri, Saeed Khani, Mohsen Damadi, Alireza Davoundnezhad, Mohammad Davoudi, Ahmadreza Darvish, Mohammadreza Dehghan, Ali Dehkordi, Shadmehr Rastin, Mojtaba Ra’ei, Morteza Razzagh Karimi, Mohammad Reza Takbiri, Mahdi Rezaei Takbiri, Ehsan Roustapour, Farid Sajjad Hosseini, Mahdi Sajjadehchi, Ali Sartipi, Mohammadreza Soroush, Mohammadreza Sokout, Ahmad Salimi, Kourosh Soleimani, Mohsen Shah-Ebrahimi, Manouchehr Shahsavari, Alireza Shoja Nouri, Mohammad Shakibania, Vajihollah Shahidi, Darioush Sadeghpour, Ahad Sadeghi, Mahdiyeh Sadeghi, Mohammad Sadeghi, Hamid Salehi, Rasoul Sadr Ameli, Mohsen Zarghami, Saeideh Arab, Mohammad-Mahdi Asgarpour, Bahram Azimi, Ali-Akbar Allafzadeh, Majid Alizadeh, Mohammad-Reza Aligholi, Nasrollah Fathian, Mehdi Fakhimzadeh, Mohammad-Reza Farahbakhsh, Mehrdad Farid, Molla-Saleh Ghari, Arash Ghasemi, Ali Ghaem-Maghami, Abdollah Ghadirian, Zhaleh Kouhpayeh, Mahdi Kouhian, Reza Kianian, Mostafa Kiaei, Mohsen Kiaei, Mohammad-Hossein Latifi, Ali Loghmani, Majid Majidi, Hossein Mahjoub, Asadllah Mohammadi, Manouchehr Mohammadi, Ahmad-Reza Mo’tamedi, Kazem Masoumi, Adel Me’marnia, Shabnam Moghaddami, Kamran Maleki, Touraj Mansouri, Fardaz Motamen, Vahid Movahhedi, Seyyed Abdoljavad Mousavi, Mohammad-Hossein Mahdavian, Seyyed Davoud Mirbagheri, Mojtaba Mirtahmasb, Maziyar Miri, Seyyed Reza Mirkarimi, Akbar Nabavimanesh, Alireza Najafzadeh, Mohammad-Ali Najafi, Javad Norouzbeigi, Mohammad-Bagher Nikkhah Bahrami, Vahid Nikkhah Azad, Afshin Hashemi, Mohammad-Reza Honarmand, Maki Paze’, Mansoureh Yazdanjou, Ahmad Yousefzadeh, Mahmoud Yarmohammadlou.