Can I enter Iran with an unused Israeli visa?

Countries that deny entry to passport holders with Israeli (valid or expired) visas and entry stamps: Iran, Syria, Lebanon, Saudi Arabia, Libya, Yemen and Sudan.

Countries where Israeli (valid or expired) visas and entry stamps are completely harmless: Egypt, Jordan, Turkey, Morocco and Tunisia.

Countries where Israel (valid or expired) visas and entry stamps are basically harmless: United Arab Emirates, Qatar, Bahrain, Oman, Malaysia, Indonesia, etc. The so-called "basically harmless" refers to countries that have not explicitly given up the policy of "denying entry to those who hold Israeli (valid or expired) visas and entry stamps", but have adopted a tolerant attitude towards Israeli visas and entry stamps in practice. According to Lonely Planet, if you don't show off stamps in front of consumers, it may be ok.

In addition, passport holders with Muslim visas and entry stamps may be severely questioned by security personnel when entering Israel, but Israel has absolutely no corresponding "denial of entry" policy. 、

Note, you have been to Israel, and there should be no clues such as labels on your luggage. If you can infer from the departure stamp that you have been to Israel, you'd better not take any risks.

In short, the best solution at present: try to go to Israel when the number of pages in your passport is about to run out or expire, and then change your passport immediately.