| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1378 by topic | |
| Leaders | |
| Political entities - State leaders - Religious leaders | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Art and literature | |
| 1378 in poetry | |
| Gregorian calendar | 1378 MCCCLXXVIII |
| Ab urbe condita | 2131 |
| Armenian calendar | 827 ԹՎ ՊԻԷ |
| Assyrian calendar | 6128 |
| Bengali calendar | 785 |
| Berber calendar | 2328 |
| English Regnal year | 1 Ric. 2 – 2 Ric. 2 |
| Buddhist calendar | 1922 |
| Burmese calendar | 740 |
| Byzantine calendar | 6886–6887 |
| Chinese calendar |
丁巳年 (Fire Snake) 4074 or 4014 — to — 戊午年 (Earth Horse) 4075 or 4015 |
| Coptic calendar | 1094–1095 |
| Discordian calendar | 2544 |
| Ethiopian calendar | 1370–1371 |
| Hebrew calendar | 5138–5139 |
| Hindu calendars | |
| - Vikram Samvat | 1434–1435 |
| - Shaka Samvat | 1299–1300 |
| - Kali Yuga | 4478–4479 |
| Holocene calendar | 11378 |
| Igbo calendar | 378–379 |
| Iranian calendar | 756–757 |
| Islamic calendar | 779–780 |
| Japanese calendar |
Eiwa 4 (永和4年) |
| Javanese calendar | 1291–1292 |
| Julian calendar | 1378 MCCCLXXVIII |
| Korean calendar | 3711 |
| Minguo calendar | 534 before ROC 民前534年 |
| Nanakshahi calendar | −90 |
| Thai solar calendar | 1920–1921 |
Year 1378 (MCCCLXXVIII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.