| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1665 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1665 MDCLXV |
| Ab urbe condita | 2418 |
| Armenian calendar | 1114 ԹՎ ՌՃԺԴ |
| Assyrian calendar | 6415 |
| Balinese saka calendar | 1586–1587 |
| Bengali calendar | 1072 |
| Berber calendar | 2615 |
| English Regnal year | 16 Cha. 2 – 17 Cha. 2 |
| Buddhist calendar | 2209 |
| Burmese calendar | 1027 |
| Byzantine calendar | 7173–7174 |
| Chinese calendar | 甲辰年 (Wood Dragon) 4362 or 4155 — to — 乙巳年 (Wood Snake) 4363 or 4156 |
| Coptic calendar | 1381–1382 |
| Discordian calendar | 2831 |
| Ethiopian calendar | 1657–1658 |
| Hebrew calendar | 5425–5426 |
| Hindu calendars | |
| - Vikram Samvat | 1721–1722 |
| - Shaka Samvat | 1586–1587 |
| - Kali Yuga | 4765–4766 |
| Holocene calendar | 11665 |
| Igbo calendar | 665–666 |
| Iranian calendar | 1043–1044 |
| Islamic calendar | 1075–1076 |
| Japanese calendar | Kanbun 5 (寛文５年) |
| Javanese calendar | 1587–1588 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3998 |
| Minguo calendar | 247 before ROC 民前247年 |
| Nanakshahi calendar | 197 |
| Thai solar calendar | 2207–2208 |
| Tibetan calendar | 阳木龙年 (male Wood-Dragon) 1791 or 1410 or 638 — to — 阴木蛇年 (female Wood-Snake) 1792 or 1411 or 639 |
1665 (MDCLXV) was a common year starting on Thursday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1665th year of the Common Era (CE) and Anno Domini (AD) designations, the 665th year of the 2nd millennium, the 65th year of the 17th century, and the 6th year of the 1660s decade. As of the start of 1665, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.