Back 1905 Abkhazian 1905 Afrikaans 1905 ALS 1905 እ.ኤ.አ. Amharic 1905 AN 1905 Arabic 1905 ARY 1905 ARZ 1905 AST 1905 AV
| Millennium: | 2nd millennium |
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| 1905 by topic |
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| Subject |
| By country |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1905 MCMV |
| Ab urbe condita | 2658 |
| Armenian calendar | 1354 ԹՎ ՌՅԾԴ |
| Assyrian calendar | 6655 |
| Baháʼí calendar | 61–62 |
| Balinese saka calendar | 1826–1827 |
| Bengali calendar | 1312 |
| Berber calendar | 2855 |
| British Regnal year | 4 Edw. 7 – 5 Edw. 7 |
| Buddhist calendar | 2449 |
| Burmese calendar | 1267 |
| Byzantine calendar | 7413–7414 |
| Chinese calendar | 甲辰年 (Wood Dragon) 4602 or 4395 — to — 乙巳年 (Wood Snake) 4603 or 4396 |
| Coptic calendar | 1621–1622 |
| Discordian calendar | 3071 |
| Ethiopian calendar | 1897–1898 |
| Hebrew calendar | 5665–5666 |
| Hindu calendars | |
| - Vikram Samvat | 1961–1962 |
| - Shaka Samvat | 1826–1827 |
| - Kali Yuga | 5005–5006 |
| Holocene calendar | 11905 |
| Igbo calendar | 905–906 |
| Iranian calendar | 1283–1284 |
| Islamic calendar | 1322–1323 |
| Japanese calendar | Meiji 38 (明治３８年) |
| Javanese calendar | 1834–1835 |
| Julian calendar | Gregorian minus 13 days |
| Korean calendar | 4238 |
| Minguo calendar | 7 before ROC 民前7年 |
| Nanakshahi calendar | 437 |
| Thai solar calendar | 2447–2448 |
| Tibetan calendar | 阳木龙年 (male Wood-Dragon) 2031 or 1650 or 878 — to — 阴木蛇年 (female Wood-Snake) 2032 or 1651 or 879 |
1905 (MCMV) was a common year starting on Sunday of the Gregorian calendar and a common year starting on Saturday of the Julian calendar, the 1905th year of the Common Era (CE) and Anno Domini (AD) designations, the 905th year of the 2nd millennium, the 5th year of the 20th century, and the 6th year of the 1900s decade. As of the start of 1905, the Gregorian calendar was 13 days ahead of the Julian calendar, which remained in localized use until 1923.
As the second year of the massive Russo-Japanese War begins, more than 100,000 die in the largest world battles of that era, and the war chaos leads to the 1905 Russian Revolution against Nicholas II of Russia (Shostakovich's 11th Symphony is subtitled The Year 1905 to commemorate this) and the start of Revolution in the Kingdom of Poland. Canada and the U.S. expand west, with the Alberta and Saskatchewan provinces and the founding of Las Vegas. 1905 is also the year in which Albert Einstein, at this time resident in Bern, publishes his four Annus Mirabilis papers in Annalen der Physik (Leipzig) (March 18, May 11, June 30 and September 27), laying the foundations for more than a century's study of theoretical physics.