2,500-year celebration of the Persian Empire

The 2,500-year celebration of the Persian Empire, officially known as the 2,500-year celebration of the Empire of Iran (Persian: جشن‌های ۲۵۰۰ ساله شاهنشاهی ایران, romanized: Jašn-hây-e 2500 sale’ šâhanšâhi Irân), was hosted by the Pahlavi dynasty in the Imperial State of Iran in October 1971. Concentrated at Persepolis, it consisted of an elaborate set of grand festivities that sought to honour the legacy of the Achaemenid Empire, which was founded by Cyrus the Great in 550 BC. The event was aimed at highlighting ancient Iranian history and also showcasing the country's contemporary advances under Mohammad Reza Pahlavi, who had been reigning as the Shah of Iran since 1941. The site brought sixty members of royalty and heads of state from abroad.

Some historians take the view that its role in the massive display of seemingly unlimited royal wealth contributed to the Iranian populace's growing frustration with the Pahlavi dynasty, while others argue that the extravagance of the proceedings was exaggerated during the Islamic Revolution to discredit the Shah's regime. As a result, some accounts have overstated the event's costs and luxuries.