Back 1780 Abkhazian 1780 Afrikaans 1780 ALS 1780 እ.ኤ.አ. Amharic 1780 AN 1780 Arabic 1780 ARY 1780 ARZ 1780 AST 1780 AVK
| Millennium: | 2nd millennium |
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| 1780 by topic |
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| Gregorian calendar | 1780 MDCCLXXX |
| Ab urbe condita | 2533 |
| Armenian calendar | 1229 ԹՎ ՌՄԻԹ |
| Assyrian calendar | 6530 |
| Balinese saka calendar | 1701–1702 |
| Bengali calendar | 1187 |
| Berber calendar | 2730 |
| British Regnal year | 20 Geo. 3 – 21 Geo. 3 |
| Buddhist calendar | 2324 |
| Burmese calendar | 1142 |
| Byzantine calendar | 7288–7289 |
| Chinese calendar | 己亥年 (Earth Pig) 4477 or 4270 — to — 庚子年 (Metal Rat) 4478 or 4271 |
| Coptic calendar | 1496–1497 |
| Discordian calendar | 2946 |
| Ethiopian calendar | 1772–1773 |
| Hebrew calendar | 5540–5541 |
| Hindu calendars | |
| - Vikram Samvat | 1836–1837 |
| - Shaka Samvat | 1701–1702 |
| - Kali Yuga | 4880–4881 |
| Holocene calendar | 11780 |
| Igbo calendar | 780–781 |
| Iranian calendar | 1158–1159 |
| Islamic calendar | 1193–1195 |
| Japanese calendar | An'ei 9 (安永９年) |
| Javanese calendar | 1705–1706 |
| Julian calendar | Gregorian minus 11 days |
| Korean calendar | 4113 |
| Minguo calendar | 132 before ROC 民前132年 |
| Nanakshahi calendar | 312 |
| Thai solar calendar | 2322–2323 |
| Tibetan calendar | 阴土猪年 (female Earth-Pig) 1906 or 1525 or 753 — to — 阳金鼠年 (male Iron-Rat) 1907 or 1526 or 754 |
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1780 (MDCCLXXX) was a leap year starting on Saturday of the Gregorian calendar and a leap year starting on Wednesday of the Julian calendar, the 1780th year of the Common Era (CE) and Anno Domini (AD) designations, the 780th year of the 2nd millennium, the 80th year of the 18th century, and the 1st year of the 1780s decade. As of the start of 1780, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.