| Years |
|---|
| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
| Years |
| Gregorian calendar | 1091 MXCI |
| Ab urbe condita | 1844 |
| Armenian calendar | 540 ԹՎ ՇԽ |
| Assyrian calendar | 5841 |
| Balinese saka calendar | 1012–1013 |
| Bengali calendar | 498 |
| Berber calendar | 2041 |
| English Regnal year | 4 Will. 2 – 5 Will. 2 |
| Buddhist calendar | 1635 |
| Burmese calendar | 453 |
| Byzantine calendar | 6599–6600 |
| Chinese calendar | 庚午年 (Metal Horse) 3787 or 3727 — to — 辛未年 (Metal Goat) 3788 or 3728 |
| Coptic calendar | 807–808 |
| Discordian calendar | 2257 |
| Ethiopian calendar | 1083–1084 |
| Hebrew calendar | 4851–4852 |
| Hindu calendars | |
| - Vikram Samvat | 1147–1148 |
| - Shaka Samvat | 1012–1013 |
| - Kali Yuga | 4191–4192 |
| Holocene calendar | 11091 |
| Igbo calendar | 91–92 |
| Iranian calendar | 469–470 |
| Islamic calendar | 483–484 |
| Japanese calendar | Kanji 5 (寛治５年) |
| Javanese calendar | 995–996 |
| Julian calendar | 1091 MXCI |
| Korean calendar | 3424 |
| Minguo calendar | 821 before ROC 民前821年 |
| Nanakshahi calendar | −377 |
| Seleucid era | 1402/1403 AG |
| Thai solar calendar | 1633–1634 |
| Tibetan calendar | ལྕགས་ཕོ་རྟ་ལོ་ (male Iron-Horse) 1217 or 836 or 64 — to — ལྕགས་མོ་ལུག་ལོ་ (female Iron-Sheep) 1218 or 837 or 65 |
1091 (MXCI) was a common year starting on Wednesday of the Julian calendar, the 1091st year of the Common Era (CE) and Anno Domini (AD) designations, the 91st year of the 2nd millennium, the 91st year of the 11th century, and the 2nd year of the 1090s decade. As of the start of 1091, the Gregorian calendar was 6 days ahead of the Julian calendar, which was the dominant calendar of the time.
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