|Centuries:||6th century – 7th century – 8th century|
|Decades:||600s 610s 620s – 630s – 640s 650s 660s|
|Years:||632 633 634 – 635 – 636 637 638|
|635 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1388|
|Bahá'í calendar||−1209 – −1208|
|English Regnal year||N/A|
|Chinese calendar||甲午年 (Wood Horse)
3331 or 3271
— to —
乙未年 (Wood Goat)
3332 or 3272
|- Vikram Samvat||691–692|
|- Shaka Samvat||557–558|
|- Kali Yuga||3736–3737|
|Igbo calendar||−365 – −364|
|Minguo calendar||1277 before ROC
|Thai solar calendar||1178|
|Wikimedia Commons has media related to 635.|
Year 635 (DCXXXV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 635 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.
- Emperor Heraclius makes an alliance with Kubrat, ruler (khagan) of Great Bulgaria, to break the power of the Avars on the Balkan Peninsula.
- Judicael, high king of Domnonée (Brittany), visits king Dagobert I at his palace in Clichy (northwestern of Paris) to promise he would remain under Frankish lordship. The Breton king arrives with gifts, but insults Dagobert by refusing to eat at the royal table.
- King Meurig of Glywysing and Gwent invades Ergyng (Archenfield) and reunites the two Welsh kingdoms (approximate date).
- King Gartnait III dies after a 4-year reign and is succeeded by his brother Bridei II as ruler of the Picts.
- January – Battle of Fahl: The Rashidun army (30,000 men) under Khalid ibn al-Walid (known as the "Drawn Sword of God") defeat the Byzantine forces led by Theodore Trithyrius at Pella in the Jordan Valley (Jordan).
- Gaza is conquered by the Muslim Arabs under 'Amr ibn al-'As. It becomes the first city in Palestine developed into a centre of Islamic law.
- Yao Silian, Chinese historian, completes his Book of Liang. It contains the history of the Liang Dynasty.
- First Christian missionaries arrive in China: Alopen, bishop of the Assyrian Church of the East, introduces Nestorian Christianity to the Tang Dynasty.
- Aidan of Lindisfarne, Irish missionary, founds the monastery of Lindisfarne in Northumbria (Northern England).
- Birinus, Frankish missionary, converts king Cynegils of Wessex and becomes the first Bishop of Dorchester.
- Benedict II, pope of the Catholic Church (d. 685)
- John V, pope of the Catholic Church (d. 686)
- May 23 – K'inich Kan B'alam II, ruler of Palenque (d. 702)
- Pippin of Herstal, Mayor of the Palace (approximate date)
- Yijing, Chinese Buddhist monk and traveler (d. 713)
- Chen Shuda, prince and chancellor of the Tang Dynasty
- June 25 – Gao zu, emperor of the Tang Dynasty (b. 566)
- Gartnait III, king of the Picts
- Wu Shihuo, father of Wu Zetian (b. 559)
- Smith, 19 and 21