| Years |
|---|
| Millennium |
| 1st millennium |
| Centuries |
| Decades |
| Years |
| 366 by topic |
|---|
| Arts, history, and science |
| Countries |
|
|
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 366 CCCLXVI |
| Ab urbe condita | 1119 |
| Assyrian calendar | 5116 |
| Balinese saka calendar | 287–288 |
| Bengali calendar | −227 |
| Berber calendar | 1316 |
| Buddhist calendar | 910 |
| Burmese calendar | −272 |
| Byzantine calendar | 5874–5875 |
| Chinese calendar | 乙丑年 (Wood Ox) 3062 or 3002 — to — 丙寅年 (Fire Tiger) 3063 or 3003 |
| Coptic calendar | 82–83 |
| Discordian calendar | 1532 |
| Ethiopian calendar | 358–359 |
| Hebrew calendar | 4126–4127 |
| Hindu calendars | |
| - Vikram Samvat | 422–423 |
| - Shaka Samvat | 287–288 |
| - Kali Yuga | 3466–3467 |
| Holocene calendar | 10366 |
| Iranian calendar | 256 BP – 255 BP |
| Islamic calendar | 264 BH – 263 BH |
| Javanese calendar | 248–249 |
| Julian calendar | 366 CCCLXVI |
| Korean calendar | 2699 |
| Minguo calendar | 1546 before ROC 民前1546年 |
| Nanakshahi calendar | −1102 |
| Seleucid era | 677/678 AG |
| Thai solar calendar | 908–909 |
| Tibetan calendar | ཤིང་མོ་གླང་ལོ་ (female Wood-Ox) 492 or 111 or −661 — to — མེ་ཕོ་སྟག་ལོ་ (male Fire-Tiger) 493 or 112 or −660 |
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366 (CCCLXVI) was a common year starting on Sunday of the Julian calendar, the 366th year of the Common Era (CE) and Anno Domini (AD) designations, the 366th year of the 1st millennium, the 66th year of the 4th century, and the 7th year of the 360s decade. As of the start of 366, the Gregorian calendar was 1 day ahead of the Julian calendar, which was the dominant calendar of the time.