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|Ab urbe condita||2101|
|Balinese saka calendar||1269–1270|
|English Regnal year||21 Edw. 3 – 22 Edw. 3|
|Chinese calendar||丁亥年 (Fire Pig)|
4044 or 3984
— to —
戊子年 (Earth Rat)
4045 or 3985
|- Vikram Samvat||1404–1405|
|- Shaka Samvat||1269–1270|
|- Kali Yuga||4448–4449|
|Japanese calendar||Jōwa 4|
|Minguo calendar||564 before ROC|
|Thai solar calendar||1890–1891|
1474 or 1093 or 321
— to —
1475 or 1094 or 322
|Wikimedia Commons has media related to 1348.|
- January – Gonville Hall, the forerunner of Gonville and Caius College, Cambridge is founded.
- April 7 – Charles University is founded in Prague.
- April 23 – Edward III of England creates the first English order of chivalry, the Most Noble Order of the Garter.
- June – Two ships enter the English Channel bringing the Black Death from France to England. By June 24 the pandemic is peaking in Melcombe Regis (near Weymouth, Dorset, England); by November it reaches London.
- July 6 – A Papal bull is issued by Pope Clement VI, protecting Jews against popular aggression during the Black Death epidemic.
- November 1 – The anti-royalist Union of Valencia attacks the Jews of Murviedro because they are serfs of the King of Valencia and thus "royalists".
- November 18 – Emperor Kōmyō of Japan abdicates the throne in favour of his son Emperor Sukō, making them the second and third of the Northern Court (Ashikaga Pretenders).
- The Black Death epidemic spreads to central and western Europe and to Cairo.
- Stefan the Mighty, Emperor of Serbia, conquers Thessaly and Epirus.
- The Pskov Republic gains independence from the Novgorod Republic with the treaty of Bolotovo.
- A de facto truce is observed between England and France until 1355.
- Estimation: Hangzhou in Mongolian China becomes the largest city of the world, taking the lead from Cairo, capital of Mamluk Egypt.
- February 2 – Narymunt, Prince of Pinsk
- June 9 – Ambrogio Lorenzetti, Sienese painter (b. 1290)
- June 13 – Juan Manuel, Prince of Villena (b. 1282)
- July 1 – Joan, Princess of England
- August 20 – Laurence Hastings, 1st Earl of Pembroke (b. 1319)
- August 23 – John de Stratford, Archbishop of Canterbury
- October 2 – Alice de Lacy, 4th Countess of Lincoln (b. 1281)
- December 2 – Emperor Hanazono, Emperor of Japan (b. 1297)
- date unknown