|Centuries:||6th century – 7th century – 8th century|
|Decades:||580s 590s 600s – 610s – 620s 630s 640s|
|Years:||615 616 617 – 618 – 619 620 621|
|618 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1371|
|Chinese calendar||丁丑年 (Fire Ox)
3314 or 3254
— to —
戊寅年 (Earth Tiger)
3315 or 3255
|- Vikram Samvat||674–675|
|- Shaka Samvat||540–541|
|- Kali Yuga||3719–3720|
|Iranian calendar||4 BP – 3 BP|
|Islamic calendar||4 BH – 3 BH|
|Minguo calendar||1294 before ROC
|Seleucid era||929/930 AG|
|Thai solar calendar||1160–1161|
Year 618 (DCXVIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 618 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.
- Byzantine–Sasanian War: A Persian expeditionary force under Shahrbaraz invade Egypt and occupy the province. After defeating the Byzantine garrisons in the Nile Valley, the Persians marched across the Libyan Desert as far as Cyrene.
- The Persians besiege Alexandria, the defence of the city is led by Nicetas (cousin of emperor Heraclius). The Byzantine resistance is undermined by a blockade of the harbor, the usual grain supplies are cut off from Egypt to Constantinople.
- June 18 – The Sui dynasty ends: The rebel leader Li Yuan captures Luoyang and has emperor Yángdi murdered. He proclaims himself emperor Gao Zu and establishes the Tang dynasty, one of the most notable dynasties in Chinese history, which will last for almost 300 years.
- Tong Yabghu Qaghan becomes the new ruler (khagan) of the Western Turkic Khaganate, founding the Khazar Khaganate. He maintains close relations with the Tang dynasty and possibly marries into the imperial family.
- Songtsän Gampo becomes the first emperor of the Tibetan Empire after his father Namri Songtsen is poisoned. During his reign he expands Tibet's power beyond Lhasa (Tibetan Plateau) and the Yarlung Valley.
- November 8 – Pope Adeodatus I dies in Rome after a 3-year reign in which he has reversed the policies of his predecessors, Boniface V and Gregory I, who favored monks over the secular clergy. Aeodatus will not be replaced until next year.
- November 8 – Pope Adeodatus I
- Dou Wei, chancellor of the Tang dynasty
- Fíngen mac Áedo Duib, king of Munster (Ireland)
- Kevin of Glendalough, Irish abbot (b. 498)
- Namri Songtsen, king of Tibet (approximate date)
- Sheguy, ruler of the Western Turkic Khaganate
- Xue Ju, emperor of Qin
- Xue Rengao, emperor of Qin
- Yángdi, emperor of the Sui dynasty (b. 569)
- Yang Gao, prince of the Sui dynasty (b. 607)
- Yang Hao, prince of the Sui dynasty
- Yang Jian, prince of the Sui dynasty
- Yang Xiu, prince of the Sui dynasty
- Yeongyang, king of Goguryeo (Korea)
- Yu Shiji, official of the Chen- and Sui dynasty
- Golden, "Introduction" 135. According to Chinese historical sources, the marriage was never carried out because of interference by the Eastern Göktürk Illig Qaghan, whose territory sat between his territory and Tang territory and who felt threatened by the proposed marriage. Zizhi Tongjian, vol. 192.