|1215 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1215 in poetry|
|Ab urbe condita||1968|
|Balinese saka calendar||1136–1137|
|English Regnal year||16 Joh. 1 – 17 Joh. 1|
|Chinese calendar||甲戌年 (Wood Dog)
3911 or 3851
— to —
乙亥年 (Wood Pig)
3912 or 3852
|- Vikram Samvat||1271–1272|
|- Shaka Samvat||1136–1137|
|- Kali Yuga||4315–4316|
|Japanese calendar||Kenpō 3
|Minguo calendar||697 before ROC
|Thai solar calendar||1757–1758|
1341 or 960 or 188
— to —
1342 or 961 or 189
|Wikimedia Commons has media related to 1215.|
- March 4 – King John of England makes an oath to Pope Innocent III as a crusader, to gain his support.
- May 31 – Mongol conquest of the Jin dynasty: after the long Battle of Zhongdu, Genghis Khan's Mongols capture and torch Beijing (the city burns for more than a month).
- June 15 – King John of England is forced, by rebellious barons of England at Runnymede, to put the Great Seal of the Realm on a set of articles confirming their rights and those of the towns and Church, and confirming the status of trial by jury, which on June 19 is confirmed as the Magna Carta.
- August – King John of England rejects the Magna Carta, leading to the First Barons' War.
- August 24 – Pope Innocent III declares the Magna Carta invalid.
- November 11 – The Fourth Council of the Lateran gathers in Rome under Pope Innocent III, who adopts the title "Vicar of Christ".
- December – First Barons' War: Alexander II of Scotland invades northern England.
- Otto IV, Holy Roman Emperor, is excommunicated and forced to abdicate as Emperor and King of Burgundy, replaced by Frederick II (King of the Romans 1212–1250).
- The Dominican Order is founded, according to some sources.
- Bhiksu Ananda of Kapitanagar completes writing the holy Buddhist book Arya Astasahasrika Prajnaparamita (sutra), in gold ink in Ranjana script.
- 1215–1216 – The Macy Jug, from Iran, is made. It is now kept at The Metropolitan Museum of Art, New York.
- Kalinga Magha, from Kalinga Province in India, lands in Sri Lanka with a force of 24,000 men, to capture the city of Polonnaruwa and depose its king, Parakrama Pandya.
- September 23 – Kublai Khan, 6th Khagan of the Mongol Empire and Genghis Khan's grandson, founder of the Yuan dynasty (d. 1294)
- date unknown
- approximately - Douceline of Digne, French beguin (d. 1274)
- possible - Pope John XXI (d. 1277)
- February 3 (or February 4) – Eustace, Bishop of Ely and former Lord Chancellor of England
- July 2 – Eisai, Japanese Buddhist priest (b. 1141)
- September 1 – Otto, bishop of Utrecht
- date unknown – Bertran de Born, French soldier and troubadour
- Esclarmonde of Foix, French Cathar
- approximately - Margaret of Beverley, Christian pilgrim (b. c. 1150)