| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1921 by topic |
|---|
| Subject |
| By country |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1921 MCMXXI |
| Ab urbe condita | 2674 |
| Armenian calendar | 1370 ԹՎ ՌՅՀ |
| Assyrian calendar | 6671 |
| Baháʼí calendar | 77–78 |
| Balinese saka calendar | 1842–1843 |
| Bengali calendar | 1328 |
| Berber calendar | 2871 |
| British Regnal year | 11 Geo. 5 – 12 Geo. 5 |
| Buddhist calendar | 2465 |
| Burmese calendar | 1283 |
| Byzantine calendar | 7429–7430 |
| Chinese calendar | 庚申年 (Metal Monkey) 4618 or 4411 — to — 辛酉年 (Metal Rooster) 4619 or 4412 |
| Coptic calendar | 1637–1638 |
| Discordian calendar | 3087 |
| Ethiopian calendar | 1913–1914 |
| Hebrew calendar | 5681–5682 |
| Hindu calendars | |
| - Vikram Samvat | 1977–1978 |
| - Shaka Samvat | 1842–1843 |
| - Kali Yuga | 5021–5022 |
| Holocene calendar | 11921 |
| Igbo calendar | 921–922 |
| Iranian calendar | 1299–1300 |
| Islamic calendar | 1339–1340 |
| Japanese calendar | Taishō 10 (大正１０年) |
| Javanese calendar | 1851–1852 |
| Juche calendar | 10 |
| Julian calendar | Gregorian minus 13 days |
| Korean calendar | 4254 |
| Minguo calendar | ROC 10 民國10年 |
| Nanakshahi calendar | 453 |
| Thai solar calendar | 2463–2464 |
| Tibetan calendar | 阳金猴年 (male Iron-Monkey) 2047 or 1666 or 894 — to — 阴金鸡年 (female Iron-Rooster) 2048 or 1667 or 895 |
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1921 (MCMXXI) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1921st year of the Common Era (CE) and Anno Domini (AD) designations, the 921st year of the 2nd millennium, the 21st year of the 20th century, and the 2nd year of the 1920s decade. As of the start of 1921, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.