| Years |
|---|
| Millennium |
| 1st millennium |
| Centuries |
| Decades |
| Years |
| 900 by topic |
|---|
| Arts, history, and science |
| Countries |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 900 CM |
| Ab urbe condita | 1653 |
| Armenian calendar | 349 ԹՎ ՅԽԹ |
| Assyrian calendar | 5650 |
| Balinese saka calendar | 821–822 |
| Bengali calendar | 307 |
| Berber calendar | 1850 |
| Buddhist calendar | 1444 |
| Burmese calendar | 262 |
| Byzantine calendar | 6408–6409 |
| Chinese calendar | 己未年 (Earth Goat) 3596 or 3536 — to — 庚申年 (Metal Monkey) 3597 or 3537 |
| Coptic calendar | 616–617 |
| Discordian calendar | 2066 |
| Ethiopian calendar | 892–893 |
| Hebrew calendar | 4660–4661 |
| Hindu calendars | |
| - Vikram Samvat | 956–957 |
| - Shaka Samvat | 821–822 |
| - Kali Yuga | 4000–4001 |
| Holocene calendar | 10900 |
| Iranian calendar | 278–279 |
| Islamic calendar | 286–288 |
| Japanese calendar | Shōtai 3 (昌泰３年) |
| Javanese calendar | 798–799 |
| Julian calendar | 900 CM |
| Korean calendar | 3233 |
| Minguo calendar | 1012 before ROC 民前1012年 |
| Nanakshahi calendar | −568 |
| Seleucid era | 1211/1212 AG |
| Thai solar calendar | 1442–1443 |
| Tibetan calendar | ས་མོ་ལུག་ལོ་ (female Earth-Sheep) 1026 or 645 or −127 — to — ལྕགས་ཕོ་སྤྲེ་ལོ་ (male Iron-Monkey) 1027 or 646 or −126 |
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900 (CM) was a leap year starting on Tuesday of the Julian calendar, the 900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 1st millennium, the 100th and last year of the 9th century, and the 1st year of the 900s decade. As of the start of 900, the Gregorian calendar was 4 days ahead of the Julian calendar, which was the dominant calendar of the time.