The land of Iran, with its ancient history and civilization and its cultural and ethnic diversity, is rich in cultural and social stories and values, which can be considered to establish hundreds of festivals. However, there are dozens of significant cultural and religious holidays and events throughout Iran, some of which are also celebrated in most Persian-speaking countries. In this article, we have collected 10 of the most famous festivals and holidays in Iran, which will surely become a memorable experience when participating in or visiting them.