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1011 in various calendars
Gregorian calendar	1011; MXI
Ab urbe condita	1764
Armenian calendar	460; ԹՎ ՆԿ
Assyrian calendar	5761
Balinese saka calendar	932–933
Bengali calendar	418
Berber calendar	1961
English Regnal year	N/A
Buddhist calendar	1555
Burmese calendar	373
Byzantine calendar	6519–6520
Chinese calendar	庚戌年 (Metal Dog); 3708 or 3501; — to —; 辛亥年 (Metal Pig); 3709 or 3502
Coptic calendar	727–728
Discordian calendar	2177
Ethiopian calendar	1003–1004
Hebrew calendar	4771–4772
Hindu calendars
- Vikram Samvat	1067–1068
- Shaka Samvat	932–933
- Kali Yuga	4111–4112
Holocene calendar	11011
Igbo calendar	11–12
Iranian calendar	389–390
Islamic calendar	401–402
Japanese calendar	Kankō 8; (寛弘８年)
Javanese calendar	913–914
Julian calendar	1011; MXI
Korean calendar	3344
Minguo calendar	901 before ROC; 民前901年
Nanakshahi calendar	−457
Seleucid era	1322/1323 AG
Thai solar calendar	1553–1554
Tibetan calendar	阳金狗年; (male Iron-Dog); 1137 or 756 or −16; — to —; 阴金猪年; (female Iron-Pig); 1138 or 757 or −15

Millennium:	2nd millennium
Centuries:	10th century; 11th century ; 12th century;
Decades:	990s; 1000s; 1010s ; 1020s; 1030s;
Years:	1008; 1009; 1010; 1011 ; 1012; 1013; 1014;

Events

June 11 – Lombard Revolt: Mahmoud the Fat of Bari rises up against the Lombard rebels, led by Melus, and delivers the city to Basil Mesardonites, Byzantine governor (catepan) of the Catepanate of Italy. Melus is forced to flee to Salerno, and his brother-in-law Dattus escapes to Monte Cassino, but their families are taken captive, and carted off to Constantinople.^[1]
Autumn – Basil Mesardonites visits Guaimar III of Salerno to secure his cooperation. Melus is forced to flee again. Basil proceeds to Monte Cassino – and persuades Abbot Atenulf to expel Dattus. Pope Sergius IV supports Dattus with papal troops, to garrison the tower on the Garigliano River, a fortified complex in the territory of the Duchy of Gaeta.
King Henry II enfeoffs Adalbero with Carinthia (including the rule over the March of Verona) after the death of Duke Conrad I.
The Grand Prince of Kyiv and ruler of Kievan Rus' Vladimir the Great laid the first foundations of Saint Sophia Cathedral, Kyiv.

September 29 – Siege of Canterbury: Danish Viking raiders led by Thorkell the Tall pillage Canterbury after a siege, taking Ælfheah, archbishop of Canterbury, as a prisoner.^[2]
Byrhtferth, Benedictine monk of Ramsey Abbey, writes his Manual (Enchiridion) on the divine order of the universe and time.^[2]

Ibn al-Haytham (Alhazen), an Arab scientist working in Egypt, feigns madness for fear of angering Caliph Al-Hakim bi-Amr Allah, and is kept under house arrest. During this time he begins writing his influential Book of Optics.
The Baghdad Manifesto is ordered by Caliph Al-Qadir of the Abbasid Caliphate, in response to the growth of the Fatimid-supporting Ismaili sect of Islam within his borders.

Emperor Ichijō abdicates the throne and dies later after a 25-year reign. He is succeeded by his cousin Sanjō as the 67th emperor of Japan.

Norwich, John Julius (1967). The Normans in the South 1016–1130. Longmans. ISBN 978-0582107519.

Palmer, Alan; Palmer, Veronica (1992). Chronology of British History. London: Century Ltd / Barrie & Jenkins. pp. 48–49. ISBN 978-0712656160.

Toumanoff, C. (1967). Studies in Christian Caucasian History. Washington D. C.: Georgetown University Press. p. 498. OCLC 901879629.