Back 1691 Abkhazian 1691 Afrikaans 1691 ALS 1691 እ.ኤ.አ. Amharic 1691 AN 1691 Arabic 1691 ARY 1691 ARZ 1691 AST 1691 AVK
| Millennium: | 2nd millennium |
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| 1691 by topic |
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| Gregorian calendar | 1691 MDCXCI |
| Ab urbe condita | 2444 |
| Armenian calendar | 1140 ԹՎ ՌՃԽ |
| Assyrian calendar | 6441 |
| Balinese saka calendar | 1612–1613 |
| Bengali calendar | 1098 |
| Berber calendar | 2641 |
| English Regnal year | 3 Will. & Mar. – 4 Will. & Mar. |
| Buddhist calendar | 2235 |
| Burmese calendar | 1053 |
| Byzantine calendar | 7199–7200 |
| Chinese calendar | 庚午年 (Metal Horse) 4388 or 4181 — to — 辛未年 (Metal Goat) 4389 or 4182 |
| Coptic calendar | 1407–1408 |
| Discordian calendar | 2857 |
| Ethiopian calendar | 1683–1684 |
| Hebrew calendar | 5451–5452 |
| Hindu calendars | |
| - Vikram Samvat | 1747–1748 |
| - Shaka Samvat | 1612–1613 |
| - Kali Yuga | 4791–4792 |
| Holocene calendar | 11691 |
| Igbo calendar | 691–692 |
| Iranian calendar | 1069–1070 |
| Islamic calendar | 1102–1103 |
| Japanese calendar | Genroku 4 (元禄４年) |
| Javanese calendar | 1614–1615 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 4024 |
| Minguo calendar | 221 before ROC 民前221年 |
| Nanakshahi calendar | 223 |
| Thai solar calendar | 2233–2234 |
| Tibetan calendar | 阳金马年 (male Iron-Horse) 1817 or 1436 or 664 — to — 阴金羊年 (female Iron-Goat) 1818 or 1437 or 665 |
1691 (MDCXCI) was a common year starting on Monday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1691st year of the Common Era (CE) and Anno Domini (AD) designations, the 691st year of the 2nd millennium, the 91st year of the 17th century, and the 2nd year of the 1690s decade. As of the start of 1691, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.
