Year 612 (DCXII) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 612 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||1365|
|Balinese saka calendar||533–534|
|Chinese calendar||辛未年 (Metal Goat)|
3308 or 3248
— to —
壬申年 (Water Monkey)
3309 or 3249
|- Vikram Samvat||668–669|
|- Shaka Samvat||533–534|
|- Kali Yuga||3712–3713|
|Iranian calendar||10 BP – 9 BP|
|Islamic calendar||10 BH – 9 BH|
|Minguo calendar||1300 before ROC|
|Seleucid era||923/924 AG|
|Thai solar calendar||1154–1155|
738 or 357 or −415
— to —
739 or 358 or −414
- August 13 – Empress Eudokia, wife of Heraclius, dies of epilepsy. She leaves two children, and is buried in the Church of the Holy Apostles in Constantinople.
- King Theudebert II is defeated by his brother Theuderic II at Toul (north-eastern France). He is captured in battle and, after having his royal paraphernalia taken, is handed over to his grandmother Brunhilda. He is put in a monastery, and assassinated with his son Merovech. Theuderic, age 25, becomes sole ruler of Austrasia and Burgundy.
- Sisebut succeeds Gundemar as king of the Visigoths. He begins a campaign against the remains of Byzantine power in Spania.
- Goguryeo–Sui War: Emperor Yángdi invades Goguryeo (Korea) with an expeditionary force of over one million men, named the "24 Armies".
- Battle of Salsu: A Sui force of 305,000 men is defeated by the Korean general Eulji Mundeok at the Yalu River; only 2,700 troops survive.
- October 22 – Sak K'uk' succeeds her father Aj Ne' Yohl Mat, as queen of the Maya state of Palenque (modern Mexico).
- May 3 – Constantine III, Byzantine emperor (d. 641)
- Aisha, wife of Muhammad (d. 678)
- Germanus of Granfelden, Frankish abbot (approximate date)
- K'ak' Chan Yopaat, king (ajaw) of Copán (approximate date)
- c. February–March – Gundemar, king of the Visigoths
- March 6 – Janaab' Pakal, king of Palenque
- August 13 – Fabia Eudokia, Byzantine empress consort
- Áed Uaridnach, High King of Ireland
- Aj Ne' Yohl Mat, king of Palenque
- Conall Laeg Breg, king of Brega (Ireland)
- Theudebert II, king of Austrasia (b. 586)
- Roger Collins, "Visigothic Spain 409–711", (Blackwell Publishing, 2004), p. 75
- "KBS World". Archived from the original on May 25, 2013. Retrieved March 27, 2013.
- "Association for Asia Research- The forgotten glory of Koguryo". Archived from the original on February 28, 2009. Retrieved March 27, 2013.