|793 by topic|
|Ab urbe condita||1546|
|Balinese saka calendar||714–715|
|Chinese calendar||壬申年 (Water Monkey)|
3489 or 3429
— to —
癸酉年 (Water Rooster)
3490 or 3430
|- Vikram Samvat||849–850|
|- Shaka Samvat||714–715|
|- Kali Yuga||3893–3894|
|Japanese calendar||Enryaku 12|
|Minguo calendar||1119 before ROC|
|Seleucid era||1104/1105 AG|
|Thai solar calendar||1335–1336|
919 or 538 or −234
— to —
920 or 539 or −233
Year 793 (DCCXCIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 793 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.
- King Charlemagne orders a 3 kilometre long channel dug from Treuchtlingen to Weißenburg (the Rhine and Danube river basins), to improve the transportation of goods between the Rhineland and Bavaria. Charlemagne's son, Pepin of Italy, campaigns against the Lombards in Benevento (Southern Italy).
- Frisian–Frankish War: Count Theoderic is sent to Frisia, to muster troops for another offensive against the Avar Khaganate. He is attacked and probably killed by Saxon rebels, near the mouth of the Weser River. The Frisians revolt, and Charlemagne deports Saxon families from north of the river Elbe.
- 8 June – Viking raiders attack the Northumbrian coast, arriving in longships from either Denmark or Norway, and sacking the monastery of Lindisfarne. Many of the monks are killed or enslaved. It is the earliest known Viking attack on the British Isles.
- Emir Hisham I of Córdoba calls for a jihad ("Holy War") against the Christian Franks. He assembles an army of 100,000 men, half of which attacks the Kingdom of Asturias, while the other half invades Languedoc, penetrating as far as Narbonne.
- Arab traders make Baghdad a financial center of the Silk Road between China and Europe. Caravans carry little or no money on their long journeys; Chinese traders use what they call fei qian ("flying money") to avoid robbery. The Arabs have adopted a similar banking system known as hawala to transmit funds (approximate date).
- August 15 – Quriaqos of Tagrit is consecrated Syriac Orthodox Patriarch of Antioch at Harran
- King Offa of Mercia founds an abbey at St Albans.
- Arnulf of Sens, Frankish nobleman (or 794)
- Li Ning, prince of the Tang Dynasty (d. 812)
- Theophylact, Byzantine co-emperor (approximate date)
- Wei Mo, chancellor of the Tang Dynasty (d. 858)
- Wu Yuanji, general of the Tang Dynasty (or 783)
- Zhou Chi, chancellor of the Tang Dynasty (d. 851)
- February 22 – Sicga, Anglo-Saxon nobleman
- Idriss I, Muslim emir and founder of the Idrisid Dynasty (or 791)
- David Nicolle (2014). The Conquest of Saxony AD 782–785, p. 20. ISBN 978-1-78200-825-5
- David Nicolle (2014). The Conquest of Saxony AD 782–785, p. 80. ISBN 978-1-78200-825-5
- Meynier, Gilbert (2010). L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658–1518). Paris: La Découverte. p. 28.