| Years |
|---|
| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
| Years |
| 1900 by topic |
|---|
| Arts, history, and science |
| Countries |
|
|
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1900 MCM |
| Ab urbe condita | 2653 |
| Armenian calendar | 1349 ԹՎ ՌՅԽԹ |
| Assyrian calendar | 6650 |
| Bahá'í calendar | 56–57 |
| Balinese saka calendar | 1821–1822 |
| Bengali calendar | 1307 |
| Berber calendar | 2850 |
| British Regnal year | 63 Vict. 1 – 64 Vict. 1 |
| Buddhist calendar | 2444 |
| Burmese calendar | 1262 |
| Byzantine calendar | 7408–7409 |
| Chinese calendar | 己亥年 (Earth Pig) 4596 or 4536 — to — 庚子年 (Metal Rat) 4597 or 4537 |
| Coptic calendar | 1616–1617 |
| Discordian calendar | 3066 |
| Ethiopian calendar | 1892–1893 |
| Hebrew calendar | 5660–5661 |
| Hindu calendars | |
| - Vikram Samvat | 1956–1957 |
| - Shaka Samvat | 1821–1822 |
| - Kali Yuga | 5000–5001 |
| Holocene calendar | 11900 |
| Igbo calendar | 900–901 |
| Iranian calendar | 1278–1279 |
| Islamic calendar | 1317–1318 |
| Japanese calendar | Meiji 33 (明治３３年) |
| Javanese calendar | 1829–1830 |
| Julian calendar | Gregorian minus 12 or 13 days |
| Korean calendar | 4233 |
| Minguo calendar | 12 before ROC 民前12年 |
| Nanakshahi calendar | 432 |
| Thai solar calendar | 2442–2443 |
| Tibetan calendar | ས་མོ་ཕག་ལོ་ (female Earth-Boar) 2026 or 1645 or 873 — to — ལྕགས་ཕོ་བྱི་བ་ལོ་ (male Iron-Rat) 2027 or 1646 or 874 |
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1900 (MCM) was an exceptional common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the start of 1900, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
Due to a leap day in the Julian Calendar, the Gregorian Calendar moved ahead by 13 days.
