|Centuries:||7th century – 8th century – 9th century|
|Decades:||690s 700s 710s – 720s – 730s 740s 750s|
|Years:||720 721 722 – 723 – 724 725 726|
|723 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1476|
|Bahá'í calendar||−1121 – −1120|
|English Regnal year||N/A|
|Chinese calendar||壬戌年 (Water Dog)
3419 or 3359
— to —
癸亥年 (Water Pig)
3420 or 3360
|- Vikram Samvat||779–780|
|- Shaka Samvat||645–646|
|- Kali Yuga||3824–3825|
|Igbo calendar||−277 – −276|
|Japanese calendar||Yōrō 7
|Minguo calendar||1189 before ROC
|Thai solar calendar||1266|
|Wikimedia Commons has media related to 723.|
Year 723 (DCCXXIII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. The denomination 723 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.
- Gunakamadeva, Lichhavi ruler (rajah), founds the city of Kathmandu (modern Nepal). During his reign, he transforms the agrarian society to an industrial city trading between India and Tibet.
- Boniface, Anglo-Saxon missionary, fells Thor's Oak (a sacred tree) near Fritzlar in Hesse, marking the decisive event in the Christianization of the northern Germanic tribes (approximate date).
- Boniface makes Büraburg, a fortified Frankish settlement, his temporary religious base.