The following lists events that have happened in 1909 in the Qajar dynasty, Iran.

Incumbents Monarch: Mohammad Ali Shah Qajar (until July 16), Ahmad Shah Qajar (starting July 16) Prime Minister: until April 29: Ahmad Moshir al-Saltaneh April 29-May 2: Kamran Mirza Nayeb al-Saltaneh May 2-May 8: vacant May 8-July 13: Javad Sa'd al-Dowleh July 17-September 30: vacant starting September 30: Mohammad Vali Khan Tonekaboni

Events January 23 – The 7.3 Borujerd earthquake affected central Iran with a maximum Mercalli intensity of IX (Violent), killing between 6,000–8000. July 16 – Ahmad Shah Qajar, the last king of Qajar dynasty, ascended to throne.

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