Year 724 (DCCXXIV) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 724 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||1477|
|Balinese saka calendar||645–646|
|Chinese calendar||癸亥年 (Water Pig)|
3420 or 3360
— to —
甲子年 (Wood Rat)
3421 or 3361
|- Vikram Samvat||780–781|
|- Shaka Samvat||645–646|
|- Kali Yuga||3824–3825|
|Japanese calendar||Yōrō 8 / Jinki 1|
|Minguo calendar||1188 before ROC|
|Seleucid era||1035/1036 AG|
|Thai solar calendar||1266–1267|
850 or 469 or −303
— to —
851 or 470 or −302
- Ragenfrid, ex-mayor of the palace of Neustria, revolts against Charles Martel. He is easily defeated, and Ragenfrid gives up his sons as hostages, in return for being allowed to keep his lands in Anjou.
- Cináed mac Írgalaig, also known as "the one-eyed", becomes High King of Ireland. 
- January 26 – Caliph Yazid II dies of tuberculosis after a 4-year reign. He is succeeded by his brother Hisham ibn Abd al-Malik, who appoints Khalid al-Qasri as governor of Iraq.
- The Turgesh Khaganate scores a major victory over the Arabs, in the "Day of Thirst" near Khujand (modern Tajikistan).
- A Muslim fleet raids the Byzantine-ruled Balearic Islands, as well as Byzantine Sardinia and Lombard Corsica.
- March 3 – Empress Genshō abdicates the throne, in favor of her 23-year-old nephew Shōmu. He is the son of the late emperor Monmu, and becomes the 45th monarch of Japan.
- K'ak' Tiliw Chan Yopaat becomes king (ajaw) of the Maya city-state of Quiriguá (Guatemala), until his death in 785.
- Shōmu orders that houses of the Japanese nobility be roofed with green tiles, as in China, and have white walls with red roof poles (approximate date).
- Pirmin, Visigothic monk, is appointed abbot of Mittelzell Abbey at Reichenau Island, which he has founded.
- Hugh of Champagne, grandson of Pepin of Herstal, is appointed bishop of Bayeux.
- David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 18). ISBN 978-184603-230-1
- Fragmentary Annals of Ireland, FA 178
- David Nicolle (2008). Poitiers AD 732, Charles Martel turns the Islamic tide (p. 41). ISBN 978-184603-230-1
- Ponsonby-Fane, Richard (1959). The Imperial House of Japan, p. 57
- Old, Hughes Oliphant (1998). The reading and preaching of the scriptures in the worship of the Christian church. Wm. Eerdmans, pp. 137–40. ISBN 978-0-8028-4619-8