The Iranian National Day is a selected date on the 1 April (1979) to commemorate the Republic Day of Iran.

Often this public holiday in Iran is not known as National Day. Having said that, financial institutions, schools and various public buildings can be closed.

The 1st of January is celebrated as The New Year in Iran to mark the beginning of a new calendar year.

May Day is yet another national holiday in Iran which is observed to commemorate the achievements of the labor movement.

Christmas Day is a public holiday in almost all of the countries and observed on December 25 to commemorate the birth of Jesus.

The Orthodox Christian and Western-Roman Catholic patronal feast day or 'name day' are celebrated in each place's patron saint's day, according to the Calendar of saints.

The largest holidays for Muslims in Iran are Eid ul-Fitr. This is celebrated immediately after the end of Ramadan and Eid al-Adha which is celebrated at the conclusion of the Hajj.

Diwali (Festival of Light) is among the most important holidays observed by Hindus, Jains and Sikhs who reside in Iran.

Jews who live in Iran commemorate several festivals: the Passover (Spring Feasts of Pesach) and Shavuot, the Rosh Hashanah (beginning of the Year), Yom Kippur (Day of Atonement), Sukkot (Tabernacles), and Shemini Atzeret (Eighth Day of Assembly).