|Centuries:||7th century – 8th century – 9th century|
|Decades:||710s 720s 730s – 740s – 750s 760s 770s|
|Years:||745 746 747 – 748 – 749 750 751|
|748 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1501|
|Chinese calendar||丁亥年 (Fire Pig)
3444 or 3384
— to —
戊子年 (Earth Rat)
3445 or 3385
|- Vikram Samvat||804–805|
|- Shaka Samvat||670–671|
|- Kali Yuga||3849–3850|
|Japanese calendar||Tenpyō 20
|Minguo calendar||1164 before ROC
|Seleucid era||1059/1060 AG|
|Thai solar calendar||1290–1291|
|Wikimedia Commons has media related to 748.|
Year 748 (DCCXLVIII) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 748 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.
- January 18 – Odilo, duke of Bavaria dies after a 12-year reign. Grifo, youngest son of Charles Martel, seeks to establish his own rule by seizing the duchy for himself and abducts Odilo's infant son Tassilo III.
- King Æthelbert II of Kent sends a message to Boniface, archbishop of Mainz, requesting two well-trained goshawks for hunting. He has earlier made a gift of two falcons and a goshawk to king Æthelbald of Mercia (approximate date).
- February 14 – Abbasid Revolution: The Hashimi rebels under Abu Muslim Khorasani take Merv, capital of the Umayyad province Khorasan (modern Iran), marking the consolidation of the Abbasid revolt. Qahtaba ibn Shabib al-Ta'i takes the cities Nishapur and Rey, defeating an Umayyad army (10,000 men) at Gorgan.
- December 9 – Nasr ibn Sayyar, Arab governor of Khorasan, dies after a 10-year administration in which he has fought vigorously against dissident tribes, Turgesh neighbors, and the Abbasids. Nasr has imposed poll taxes (jizya) on non-Muslims, and introduced a system of land taxation for Muslim Arabs.
- The city of Baalbek (modern Lebanon) is sacked with great slaughter.
- An earthquake strikes the Middle East from northern Egypt to northwestern Mesopotamia, destroying many remnants of Byzantine culture (approximate date).
- Cellan of Clonfert, Irish abbot
- Eadbert I, king of Kent (approximate date)
- May 22 – Genshō, empress of Japan (b. 683)
- December 9 – Nasr ibn Sayyar, Arab general (b. 663)
- January 18 – Odilo, duke of Bavaria
- Wasil ibn Ata, Muslim theologian and jurist (b. 700)