1921

From top to bottom, left to right: The Tulsa race massacre destroys the prosperous Greenwood District of Tulsa, Oklahoma, killing hundreds and razing thousands of homes and businesses; the Russian famine of 1921–1922 kills an estimated five million in the Russian Soviet Federative Socialist Republic, prompting limited international aid; the Red Army invasion of Georgia brings the Democratic Republic of Georgia under Soviet control; the Anglo-Irish Treaty ends the Irish War of Independence, creating the Irish Free State as a self-governing dominion; the Rif War begins as Berber tribes led by Abd el-Krim resist Spanish colonial rule in northern Morocco; and the Kronstadt rebellion sees Soviet sailors and workers rise against Bolshevik rule before being crushed by the Red Army.
1921 in various calendars
Gregorian calendar1921
MCMXXI
Ab urbe condita2674
Armenian calendar1370
ԹՎ ՌՅՀ
Assyrian calendar6671
Baháʼí calendar77–78
Balinese saka calendar1842–1843
Bengali calendar1327–1328
Berber calendar2871
British Regnal year11 Geo. 5 – 12 Geo. 5
Buddhist calendar2465
Burmese calendar1283
Byzantine calendar7429–7430
Chinese calendar庚申年 (Metal Monkey)
4618 or 4411
    — to —
辛酉年 (Metal Rooster)
4619 or 4412
Coptic calendar1637–1638
Discordian calendar3087
Ethiopian calendar1913–1914
Hebrew calendar5681–5682
Hindu calendars
 - Vikram Samvat1977–1978
 - Shaka Samvat1842–1843
 - Kali Yuga5021–5022
Holocene calendar11921
Igbo calendar921–922
Iranian calendar1299–1300
Islamic calendar1339–1340
Japanese calendarTaishō 10
(大正10年)
Javanese calendar1851–1852
Juche calendar10
Julian calendarGregorian minus 13 days
Korean calendar4254
Minguo calendarROC 10
民國10年
Nanakshahi calendar453
Thai solar calendar2463–2464
Tibetan calendarལྕགས་ཕོ་སྤྲེ་ལོ་
(male Iron-Monkey)
2047 or 1666 or 894
    — to —
ལྕགས་མོ་བྱ་ལོ་
(female Iron-Bird)
2048 or 1667 or 895

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.