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This article is about the year 1248.
|Centuries:||12th century – 13th century – 14th century|
|Decades:||1210s 1220s 1230s – 1240s – 1250s 1260s 1270s|
|Years:||1245 1246 1247 – 1248 – 1249 1250 1251|
|1248 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1248 in poetry|
|Ab urbe condita||2001|
|Bahá'í calendar||−596 – −595|
|English Regnal year||32 Hen. 3 – 33 Hen. 3|
|Chinese calendar||丁未年 (Fire Goat)
3944 or 3884
— to —
戊申年 (Earth Monkey)
3945 or 3885
|- Vikram Samvat||1304–1305|
|- Shaka Samvat||1170–1171|
|- Kali Yuga||4349–4350|
|Japanese calendar||Hōji 2
|Minguo calendar||664 before ROC
|Thai solar calendar||1791|
|Wikimedia Commons has media related to 1248.|
- April 26 – The Gothic chapel Sainte-Chapelle is consecrated in Paris, France.
- August 15 – The foundation stone of the Cologne cathedral is laid after an older cathedral on the site burns down on April 30. Construction is completed 632 years later, in 1880.
- King Louis IX of France launches the Seventh Crusade, leading an army of 20,000 toward Egypt.
- Reconquista: King Ferdinand III of Castile recaptures the city of Seville from the Moors and Prince Alfonso X of Castile the city of Alicante.
- Roger Bacon publishes the formula for black powder in Europe.
- Pope Innocent IV grants the Croats permission to use their own language and script in liturgy (see Glagolitic alphabet).
- Construction on the Alhambra palace, in Granada, Spain, is begun by the Nasrids.
- The University of Piacenza is founded.
- Tallinn (Reval) converts from Riga law to Lübeck law.
- The Dutch city of Ommen receives city rights and fortification rights from Otto III, Archbishop of Utrecht on August 25.
- The Aztec Empire is established.
- In the middle of the night on November 24 a mass on the north side of Mont Granier suddenly collapsed, in one of the largest historical rock slope failures known in Europe. 
- Blanche of Artois, regent of Navarre (approximate date) (d. 1300)
- Robert II, Duke of Burgundy (d. 1306)
- King Charles II of Naples (approximate date)
- Peter Olivi, Franciscan theologian
- January 4 – King Sancho II of Portugal
- February 1 – Henry II, Duke of Brabant (b. 1207)
- June 11 – Adachi Kagemori, Japanese samurai
- Güyük Khan, ruler of the Mongol Empire
- Harald Olafsson, King of Mann and the Isles and his wife, Cecilia, daughter of Haakon Haakonarson, King of Norway. The two were newly weds who drowned near Shetland on their return to Kingdom of Mann and the Isles.
- Subutai, Mongol general