Year 763 (DCCLXIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 763 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||1516|
|Balinese saka calendar||684–685|
|Chinese calendar||壬寅年 (Water Tiger)|
3459 or 3399
— to —
癸卯年 (Water Rabbit)
3460 or 3400
|- Vikram Samvat||819–820|
|- Shaka Samvat||684–685|
|- Kali Yuga||3863–3864|
|Japanese calendar||Tenpyō-hōji 7|
|Minguo calendar||1149 before ROC|
|Seleucid era||1074/1075 AG|
|Thai solar calendar||1305–1306|
889 or 508 or −264
— to —
890 or 509 or −263
- June – Battle of Anchialus: Emperor Constantine V sends a Byzantine expeditionary force (800 ships and 9,600 cavalry) to Thrace, to defend the fortress city of Anchialus on the Black Sea Coast. Meanwhile, Telets, ruler (khagan) of the Bulgarian Empire, blocks the mountain passes and takes positions on the heights near Anchialus. During a desperate cavalry charge ,the Bulgars are defeated and many are captured; Telets manages to escape. Constantine enters Constantinople in triumph, and kills all the prisoners.
- August – Byzantine troops invade the Papal States, in alliance with King Desiderius of the Lombards. King Pepin III ("the Short") intervenes, and begins negotiations between the Lombards and Pope Paul I. Desiderius promises to end the hostilities, but on condition that Pepin sends back Lombard hostages held by the Franks.
- January 21 – Battle of Bakhamra: The Abbasid army under Isa ibn Musa defeats the Alids, and puts an end to their rebellion. The power of the Abbasid Dynasty is consolidated.
- February 17 – An Lushan Rebellion: Emperor Shi Chaoyi hangs himself to avoid being captured by Tang troops sent by the renegade Li Huaixian, ending the 7-year rebellion against the Tang Dynasty in China.
- November 18 – Forces of the Tibetan Empire, under Trisong Detsen, occupy the Tang capital of Chang'an (modern Xi'an) for 15 days, and install a puppet emperor. Tibetans take over the horse pastures.