The culture of Iran or culture of Persia is among the most influential in the world. Iran (Persia) is widely considered to be one of the cradles of civilization. Due to its dominant geopolitical position in the world, it has heavily influenced peoples and cultures situated as far away as Southern Europe and Eastern Europe to the west; Central Asia to the north; the Arabian Peninsula to the south; and South Asia, East Asia, and Southeast Asia to the east. Iranian history has had a significant influence on the world through art, architecture, poetry, science and technology, medicine, philosophy, and engineering.

Persian literature comprises oral compositions and written texts in the Persian language and is one of the world's oldest literatures. It spans over two-and-a-half millennia. Its sources have been within Greater Iran including present-day Iran, Iraq, Afghanistan, the Caucasus, and Turkey, regions of Central Asia, South Asia and the Balkans where the Persian language has historically been either the native or official language. For example, Rumi, one of the best-loved Persian poets, born in Balkh or Wakhsh, wrote in Persian and lived in Konya, at that time the capital of the Seljuks in Anatolia. The Ghaznavids conquered large territories in Central and South Asia and adopted Persian as their court language. There is thus Persian literature from Iran, Mesopotamia, Azerbaijan, the wider Caucasus, Turkey, Pakistan, Bangladesh, India, Tajikistan and other parts of Central Asia, as well as the Balkans. Not all Persian literature is written in Persian, as some consider works written by ethnic Persians or Iranians in other languages, such as Greek and Arabic, to be included. At the same time, not all literature written in Persian is written by ethnic Persians or Iranians, as Turkic, Caucasian, Indic and Slavic poets and writers have also used the Persian language in the environment of Persianate cultures.