Year 609 (DCIX) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 609 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
|Ab urbe condita||1362|
|Balinese saka calendar||530–531|
|Chinese calendar||戊辰年 (Earth Dragon)|
3305 or 3245
— to —
己巳年 (Earth Snake)
3306 or 3246
|- Vikram Samvat||665–666|
|- Shaka Samvat||530–531|
|- Kali Yuga||3709–3710|
|Iranian calendar||13 BP – 12 BP|
|Islamic calendar||13 BH – 12 BH|
|Minguo calendar||1303 before ROC|
|Seleucid era||920/921 AG|
|Thai solar calendar||1151–1152|
735 or 354 or −418
— to —
736 or 355 or −417
- Nicetas, cousin of future emperor Heraclius, launches an overland invasion in Egypt. He defeats a Byzantine army under Bonus (comes Orientis) outside Alexandria, sent from Constantinople.
- Battle of Dhi Qar: Arab tribesmen of Bakr ibn Wa'il defeat a Persian force (5,000 men), at a watering place near Kufa (Southern Iraq).
- Emperor Yángdi completes the Grand Canal; it provides an unbroken inland ship transport between the Yellow and Yangtze rivers. The canal network is 1,776 km (1,400 miles) long—linking five river systems—and extends from Beijing to the city of Hangzhou.
- The Sui Dynasty government records a tax census of roughly 9 million registered households in the Chinese Empire, a population size of roughly 50 million people.
- Shibi Khan becomes the ninth ruler (khagan) of the Eastern Turkic Khaganate (approximate date).
- May 13 – The Pantheon in Rome is consecrated as "St. Mary and the Martyrs" (informally known as "Santa Maria Rotonda") by Pope Boniface IV (or 610).
- MacDonald 1976, p. 18