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1181 in various calendars
Gregorian calendar	1181; MCLXXXI
Ab urbe condita	1934
Armenian calendar	630; ԹՎ ՈԼ
Assyrian calendar	5931
Balinese saka calendar	1102–1103
Bengali calendar	588
Berber calendar	2131
English Regnal year	27 Hen. 2 – 28 Hen. 2
Buddhist calendar	1725
Burmese calendar	543
Byzantine calendar	6689–6690
Chinese calendar	庚子年 (Metal Rat); 3878 or 3671; — to —; 辛丑年 (Metal Ox); 3879 or 3672
Coptic calendar	897–898
Discordian calendar	2347
Ethiopian calendar	1173–1174
Hebrew calendar	4941–4942
Hindu calendars
- Vikram Samvat	1237–1238
- Shaka Samvat	1102–1103
- Kali Yuga	4281–4282
Holocene calendar	11181
Igbo calendar	181–182
Iranian calendar	559–560
Islamic calendar	576–577
Japanese calendar	Jishō 5 / Yōwa 1; (養和元年)
Javanese calendar	1088–1089
Julian calendar	1181; MCLXXXI
Korean calendar	3514
Minguo calendar	731 before ROC; 民前731年
Nanakshahi calendar	−287
Seleucid era	1492/1493 AG
Thai solar calendar	1723–1724
Tibetan calendar	阳金鼠年; (male Iron-Rat); 1307 or 926 or 154; — to —; 阴金牛年; (female Iron-Ox); 1308 or 927 or 155

Millennium:	2nd millennium
Centuries:	11th century; 12th century ; 13th century;
Decades:	1160s; 1170s; 1180s ; 1190s; 1200s;
Years:	1178; 1179; 1180; 1181 ; 1182; 1183; 1184;

Year 1181 (MCLXXXI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.

Events

King Philip II (Augustus) annuls all loans made by Jews to Christians, and takes a percentage for himself. A year later, he confiscates all Jewish property and expels the Jews from Paris.^[1]
Philip II begins a war against Philip of Alsace, count of Flanders, over the Vermandois. He claims the territory for his wife Isabella of Hainault as her dowry. Philip is unwilling to give it up.^[2]
Henry the Lion, duke of Saxony, submits to Emperor Frederick I (Barbarossa) at an Imperial Diet in Erfurt. He is banished to England and retains only Brunswick among his former lands.^[3]
King Béla III of Hungary and Croatia goes to war with Venice in an effort to recover Dalmatia. The city of Zadar (located on the Adriatic Sea) accepts Béla's suzerainty.^[4]
After a series of defeats, the Almohad fleet under the admiral Ahmad al-Siqilli, crushes the Portuguese navy and reasserts its control over the Atlantic Ocean.^[5]
The word Albigensians is first used by Geoffroy du Breuil of Vigeois, French abbot and chronicler, to describe the inhabitants of Albi in southern France.

King Henry II removes Hugh de Lacy, lord of Meath, from his position as procurator of Ireland, possibly because of his having married the daughter of High King Ruaidrí Ua Conchobair.

Summer – Raynald of Châtillon, lord of Oultrejordain, raids Saladin's territory, reaching as far as Tabuk (modern Saudi Arabia) on the route between Damascus and Mecca. In November, Saladin sends an expedition under his nephew, Farrukh Shah, who invades Oultrejordain. Raynald of Châtillon is forced to withdraw home. Saladin complains to King Baldwin IV of Jerusalem (the Leper) for breaking the treaty (see 1180) and demands compensation.^[6]

March 20 – Taira no Kiyomori, Japanese military leader and dictator, dies at Kyoto. He established the first samurai-dominated administrative government in Japan.
Jayavarman VII defeats the Chams and assumes control over the Khmer Empire (modern Cambodia).
The Yōwa era is marked by famine in Japan, during the period from July 1181 through May 1182.

August 30 – Pope Alexander III dies after a 22-year pontificate at Rome. He is succeeded by the Tuscany-born Lucius III as the 171st pope of the Catholic Church.

January – William VIII of Montpellier frees the teaching of medicine from any monopoly in France,^[7] an origin of the University of Montpellier.
Chinese and Japanese astronomers observe what has come to be understood as supernova SN 1181. One of only eight supernovae in the Milky Way observed in recorded history. It appears in the constellation Cassiopeia and is visible in the night sky for about 185 days. The radio source 3C58 was thought to be the remnant from this event, but opinion is shifting towards the recently discovered nebula Pa 30 (ref : Arxiv 2105.12384).

^ Baldwin, John (2006). Paris 1200. Paris: Aubier. p. 75.
^ Bradbury, Jim. (1997). Philip Augustus: King of France 1180–1223, p. 245. The Medieval World (1st ed.). Routledge. ISBN 978-0-582-06059-3.
^ Williams, Hywel (2005). Cassell's Chronology of World History, p. 128. ISBN 0-304-35730-8.
^ Stephenson, Paul (2000). Byzantium's Balkan Frontier: A Political Study of the Northern Balkans, 900–1204, p. 281. Cambridge University Press. ISBN 978-0-521-02756-4.
^ Picard, Christophe (1997). La mer et les musulmans d'Occident VIIIe-XIIIe siècle. Paris: Presses Universitaires de France.
^ Steven Runciman (1952). A History of The Crusades. Vol II: Kingdom of Jerusalem, p. 351. ISBN 978-0241-29876-3.
^ Mélanges d'histoire de la médecine hébraïque, by Gad Freudenthal, Samuel S. Kottek, Paul Fenton compiled by Gad Freudenthal, Samuel S. Kottek published by Brill, 2002 ISBN 90-04-12522-1, 978-90-04-12522-3
^ Makk, Ferenc (1994). "Lukács". In Kristó, Gyula; Engel, Pál; Makk, Ferenc (eds.). Korai magyar történeti lexikon (9–14. század) [Encyclopedia of the Early Hungarian History (9th–14th centuries)] (in Hungarian). Akadémiai Kiadó. pp. 417–420. ISBN 963-05-6722-9.