| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
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| 1643 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1643 MDCXLIII |
| Ab urbe condita | 2396 |
| Armenian calendar | 1092 ԹՎ ՌՂԲ |
| Assyrian calendar | 6393 |
| Balinese saka calendar | 1564–1565 |
| Bengali calendar | 1050 |
| Berber calendar | 2593 |
| English Regnal year | 18 Cha. 1 – 19 Cha. 1 |
| Buddhist calendar | 2187 |
| Burmese calendar | 1005 |
| Byzantine calendar | 7151–7152 |
| Chinese calendar | 壬午年 (Water Horse) 4340 or 4133 — to — 癸未年 (Water Goat) 4341 or 4134 |
| Coptic calendar | 1359–1360 |
| Discordian calendar | 2809 |
| Ethiopian calendar | 1635–1636 |
| Hebrew calendar | 5403–5404 |
| Hindu calendars | |
| - Vikram Samvat | 1699–1700 |
| - Shaka Samvat | 1564–1565 |
| - Kali Yuga | 4743–4744 |
| Holocene calendar | 11643 |
| Igbo calendar | 643–644 |
| Iranian calendar | 1021–1022 |
| Islamic calendar | 1052–1053 |
| Japanese calendar | Kan'ei 20 (寛永２０年) |
| Javanese calendar | 1564–1565 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3976 |
| Minguo calendar | 269 before ROC 民前269年 |
| Nanakshahi calendar | 175 |
| Thai solar calendar | 2185–2186 |
| Tibetan calendar | 阳水马年 (male Water-Horse) 1769 or 1388 or 616 — to — 阴水羊年 (female Water-Goat) 1770 or 1389 or 617 |
1643 (MDCXLIII) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1643rd year of the Common Era (CE) and Anno Domini (AD) designations, the 643rd year of the 2nd millennium, the 43rd year of the 17th century, and the 4th year of the 1640s decade. As of the start of 1643, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.