|Centuries:||6th century – 7th century – 8th century|
|Decades:||610s 620s 630s – 640s – 650s 660s 670s|
|Years:||645 646 647 – 648 – 649 650 651|
|648 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1401|
|Chinese calendar||丁未年 (Fire Goat)
3344 or 3284
— to —
戊申年 (Earth Monkey)
3345 or 3285
|- Vikram Samvat||704–705|
|- Shaka Samvat||570–571|
|- Kali Yuga||3749–3750|
|Japanese calendar||Taika 4
|Minguo calendar||1264 before ROC
|Seleucid era||959/960 AG|
|Thai solar calendar||1190–1191|
Year 648 (DCXLVIII) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 648 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 Constans II, to quiet the intense controversy caused by the Monothelete doctrine, issues an imperial edict forbidding the subject to be discussed. This edict, distributed by patriarch Paul II in Constans' name, is known as the Typos.
- King Sigebert II of Austrasia is advised by Remaclus to establish a double-monastery at Stavelot and Malmedy. As a missionary bishop he founds an abbey on the River Amblève (modern Belgium).
- King Cenwalh of Wessex returns from a 3-year exile in East Anglia to reclaim his kingdom. He gives 3,000 hides of land around Ashdown to his nephew, Cuthred, possibly sub-king of Berkshire (England).
- Cenwahl invites bishop Birinus to establish under his direction the Old Minster in Winchester. Together they have a small stone church built.
- Tang general Ashina She'er re-established Tang control of Karasahr and leads a military campaign against the Tarim Basin kingdom of Kucha in Xinjiang, a vassal of the Western Turkic Khaganate.
- The Book of Jin is compiled in China during the Tang Dynasty. Its chief editor is the chancellor Fang Xuanling, who dies in this year as well.
- Fang Xuanling, chancellor of the Tang Dynasty (b. 579)
- Ma Zhou, chancellor of the Tang Dynasty (b. 601)
- April 17 – Xiao, empress of the Sui Dynasty
- Kirby, 2000, p. 45