901
| Years | 
|---|
| Millennium | 
| 1st millennium | 
| Centuries | 
| Decades | 
| Years | 
| 901 by topic | 
|---|
| Leaders | 
| Categories | 
| 
 | 
| Gregorian calendar | 901 CMI | 
| Ab urbe condita | 1654 | 
| Armenian calendar | 350 ԹՎ ՅԾ | 
| Assyrian calendar | 5651 | 
| Balinese saka calendar | 822–823 | 
| Bengali calendar | 307–308 | 
| Berber calendar | 1851 | 
| Buddhist calendar | 1445 | 
| Burmese calendar | 263 | 
| Byzantine calendar | 6409–6410 | 
| Chinese calendar | 庚申年 (Metal Monkey) 3598 or 3391 — to — 辛酉年 (Metal Rooster) 3599 or 3392 | 
| Coptic calendar | 617–618 | 
| Discordian calendar | 2067 | 
| Ethiopian calendar | 893–894 | 
| Hebrew calendar | 4661–4662 | 
| Hindu calendars | |
| - Vikram Samvat | 957–958 | 
| - Shaka Samvat | 822–823 | 
| - Kali Yuga | 4001–4002 | 
| Holocene calendar | 10901 | 
| Iranian calendar | 279–280 | 
| Islamic calendar | 288–289 | 
| Japanese calendar | Shōtai 4 / Engi 1 (延喜元年) | 
| Javanese calendar | 799–800 | 
| Julian calendar | 901 CMI | 
| Korean calendar | 3234 | 
| Minguo calendar | 1011 before ROC 民前1011年 | 
| Nanakshahi calendar | −567 | 
| Seleucid era | 1212/1213 AG | 
| Thai solar calendar | 1443–1444 | 
| Tibetan calendar | 阳金猴年 (male Iron-Monkey) 1027 or 646 or −126 — to — 阴金鸡年 (female Iron-Rooster) 1028 or 647 or −125 | 
Year 901 (CMI) was a common year starting on Thursday of the Julian calendar.