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1055 in various calendars
Gregorian calendar	1055; MLV
Ab urbe condita	1808
Armenian calendar	504; ԹՎ ՇԴ
Assyrian calendar	5805
Balinese saka calendar	976–977
Bengali calendar	462
Berber calendar	2005
English Regnal year	N/A
Buddhist calendar	1599
Burmese calendar	417
Byzantine calendar	6563–6564
Chinese calendar	甲午年 (Wood Horse); 3752 or 3545; — to —; 乙未年 (Wood Goat); 3753 or 3546
Coptic calendar	771–772
Discordian calendar	2221
Ethiopian calendar	1047–1048
Hebrew calendar	4815–4816
Hindu calendars
- Vikram Samvat	1111–1112
- Shaka Samvat	976–977
- Kali Yuga	4155–4156
Holocene calendar	11055
Igbo calendar	55–56
Iranian calendar	433–434
Islamic calendar	446–447
Japanese calendar	Tengi 3; (天喜３年)
Javanese calendar	958–959
Julian calendar	1055; MLV
Korean calendar	3388
Minguo calendar	857 before ROC; 民前857年
Nanakshahi calendar	−413
Seleucid era	1366/1367 AG
Thai solar calendar	1597–1598
Tibetan calendar	阳木马年; (male Wood-Horse); 1181 or 800 or 28; — to —; 阴木羊年; (female Wood-Goat); 1182 or 801 or 29

Millennium:	2nd millennium
Centuries:	10th century; 11th century ; 12th century;
Decades:	1030s; 1040s; 1050s ; 1060s; 1070s;
Years:	1052; 1053; 1054; 1055 ; 1056; 1057; 1058;

1055 (MLV) was a common year starting on Sunday of the Julian calendar.

Events

January 11 – Emperor Constantine IX Monomachos dies after a 12½-year reign at Constantinople. He is succeeded by Theodora (a sister of the former Empress Zoë), who is proclaimed by the imperial guard (with strong opposition from the council) as empress of the Byzantine Empire.

King Ferdinand I of León ("the Great") begins his campaign against al-Andalus. He conquers Seia from the Christian allies of the Muslim taifas.^[1] In a drive to consolidate his southern border in Portugal he re-populates the city of Zamora with some of his Cantabrian (montañeses) subjects.

October 24 – Ælfgar, Earl of Mercia, is outlawed by the witan ("meeting of wise men"). In revenge he builds a force and allies himself with the Welsh king Gruffydd ap Llywelyn. After defeating Ralph the Timid (a nephew of King Edward the Confessor), they attack Hereford and raid the church – taking everything of value, leaving the building on fire. The rebels also attack Leominster.
Edward the Confessor gives Tostig Godwinson (upon the death of Earl Siward) the important position as earl of Northumbria and the difficult mission of bringing the northern state under control.^[2]

Winter – The Seljuk Turks led by Sultan Tughril capture Baghdad and enter the city in a Roman-styled triumph. Al-Malik al-Rahim, the last Buyid emir in Iraq, is taken prisoner.

Construction on the Liaodi Pagoda in Hebei is completed (the tallest pagoda in Chinese history, standing at a height of 84 m (275 ft) tall).

King Andrew I of Hungary ("the Catholic") establishes the Benedictine Tihany Abbey. Its foundation charter is the earliest written record extant in the Hungarian language.
April 13 – Pope Victor II succeeds Leo IX as the 153rd pope of the Catholic Church in Rome (until 1057).

^ Picard, Christophe (2000). Le Portugal musulman (VIIIe-XIIIe siècle. L'Occident d'al-Andalus sous domination islamique. Paris: Maisonneuve & Larose. p. 109. ISBN 2-7068-1398-9.
^ MacLean, Mark (1999). "History of Ireleth and Askam-in-Furness". Bruderlin MacLean Publishing Services. Archived from the original on March 5, 2017. Retrieved March 30, 2016.