|Centuries:||6th century – 7th century – 8th century|
|Decades:||620s 630s 640s – 650s – 660s 670s 680s|
|Years:||653 654 655 – 656 – 657 658 659|
|656 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1409|
|Chinese calendar||乙卯年 (Wood Rabbit)
3352 or 3292
— to —
丙辰年 (Fire Dragon)
3353 or 3293
|- Vikram Samvat||712–713|
|- Shaka Samvat||577–578|
|- Kali Yuga||3756–3757|
|Minguo calendar||1256 before ROC
|Seleucid era||967/968 AG|
|Thai solar calendar||1198–1199|
Year 656 (DCLVI) was a leap year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 656 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.
- February 1 – King Sigebert III of Austrasia, age 25, dies after a 22-year reign. His 5-year-old son Dagobert II is kidnapped by the court chancellor, Grimoald the Elder, who makes his own son king; and exiles him to an Irish monastery. Dagobert is placed with Dido, bishop of Poitiers, while Grimoald's son Childebert the Adopted assumes the Austrasian throne.
- King Oswiu of Northumbria invades Pengwern (modern Wales) and kills king Cynddylan in battle, near the River Trent. His brother Morfael and the remains of the royal family flee to Glastening (Wessex).
- King Œthelwald of Deira is removed from office by his uncle Oswiu, because of his desertion at the Battle of the Winwaed, and replaced by the latter's son Alhfrith, as subject king in a united Northumbria.
- First Islamic Civil War: An armed revolt erupt in Egypt, several Muslim sympathisers travel to Medina to rally support, beginning the fitna (literally meaning the 'trail of faith'). The Muslim expansion come to a halt, the martial energies of the Islamic forces are direct inwards.
- June 20 – Uthman ibn Affan is murdered at Medina after an 11-year reign. He is succeeded by Muhammad's cousin and son-in-law Ali ibn Abi-Talib who becomes the fourth caliph of the Rashidun Caliphate. He makes Kufah (Iraq) his capital, but the succession is disputed.
- November 7 – Battle of the Camel: Rebel Arabs under Aisha (widow of Muhammad) begin a revolt against Ali. They are defeated at Basra and Aisha is exiled to Medina. During the battle 10,000 people lost their life, with each party bearing equal loss.
- Abdullah ibn Sa'ad, governor of Upper Egypt, dies after a 12-year regime in which he has defeated neighboring Nubia.
- Empress Saimei of Japan builds a new palace at Asuka (Nara Prefecture), because her former residence took fire. This construction is called the "Mad Canal" by the people of that day, wasting the labor of tens of thousand workers and a large amount of money.
- September 24 – A total solar eclipse is observable from Easter Island. The next at this location is not until July 11, 2010.
- Li Xiăn, seventh son of the Chinese emperor Gao Zong, is made crown prince. His lavish palatial mansion in Chang'an is converted into a Daoist abbey during the Tang Dynasty (approximate date).
- The Yasaka Shrine is constructed in the Gion district of Kyoto (Japan).
- Abdullah ibn Sa'ad, Arab governor
- Crundmáel Erbuilc, king of the Uí Ceinnselaig (Ireland)
- Cui Dunli, general of the Tang Dynasty (b. 596)
- Cynddylan, king of Pengwern (Wales)
- Li Daozong, prince of the Tang Dynasty
- Peada, king of Mercia (Midlands)
- February 1 – Sigebert III, king of Austrasia (or 660)
- June 20 – Uthman ibn Affan, Muslim Caliph (b. 577)
- Zubayr ibn Al-Awam, Arab general (b. 594)
- The Great Islamic Conquests AD 632–750, David Nicolle (2009), p. 62. ISBN 978-1-84603-273-8
- The Caliphate Its Rise, Decline and Fall by William Muir. Chapter XXXV, Battle of the Camel, p. 250