| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1731 by topic |
|---|
| Arts and science |
| Countries |
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 1731 MDCCXXXI |
| Ab urbe condita | 2484 |
| Armenian calendar | 1180 ԹՎ ՌՃՁ |
| Assyrian calendar | 6481 |
| Balinese saka calendar | 1652–1653 |
| Bengali calendar | 1138 |
| Berber calendar | 2681 |
| British Regnal year | 4 Geo. 2 – 5 Geo. 2 |
| Buddhist calendar | 2275 |
| Burmese calendar | 1093 |
| Byzantine calendar | 7239–7240 |
| Chinese calendar | 庚戌年 (Metal Dog) 4428 or 4221 — to — 辛亥年 (Metal Pig) 4429 or 4222 |
| Coptic calendar | 1447–1448 |
| Discordian calendar | 2897 |
| Ethiopian calendar | 1723–1724 |
| Hebrew calendar | 5491–5492 |
| Hindu calendars | |
| - Vikram Samvat | 1787–1788 |
| - Shaka Samvat | 1652–1653 |
| - Kali Yuga | 4831–4832 |
| Holocene calendar | 11731 |
| Igbo calendar | 731–732 |
| Iranian calendar | 1109–1110 |
| Islamic calendar | 1143–1144 |
| Japanese calendar | Kyōhō 16 (享保１６年) |
| Javanese calendar | 1655–1656 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4064 |
| Minguo calendar | 181 before ROC 民前181年 |
| Nanakshahi calendar | 263 |
| Thai solar calendar | 2273–2274 |
| Tibetan calendar | 阳金狗年 (male Iron-Dog) 1857 or 1476 or 704 — to — 阴金猪年 (female Iron-Pig) 1858 or 1477 or 705 |
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1731 (MDCCXXXI) was a common year starting on Monday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1731st year of the Common Era (CE) and Anno Domini (AD) designations, the 731st year of the 2nd millennium, the 31st year of the 18th century, and the 2nd year of the 1730s decade. As of the start of 1731, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.