1451
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1451 by topic | 
|---|
| Arts and science | 
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1451 in poetry | 
| Gregorian calendar | 1451 MCDLI | 
| Ab urbe condita | 2204 | 
| Armenian calendar | 900 ԹՎ Ջ | 
| Assyrian calendar | 6201 | 
| Balinese saka calendar | 1372–1373 | 
| Bengali calendar | 857–858 | 
| Berber calendar | 2401 | 
| English Regnal year | 29 Hen. 6 – 30 Hen. 6 | 
| Buddhist calendar | 1995 | 
| Burmese calendar | 813 | 
| Byzantine calendar | 6959–6960 | 
| Chinese calendar | 庚午年 (Metal Horse) 4148 or 3941 — to — 辛未年 (Metal Goat) 4149 or 3942 | 
| Coptic calendar | 1167–1168 | 
| Discordian calendar | 2617 | 
| Ethiopian calendar | 1443–1444 | 
| Hebrew calendar | 5211–5212 | 
| Hindu calendars | |
| - Vikram Samvat | 1507–1508 | 
| - Shaka Samvat | 1372–1373 | 
| - Kali Yuga | 4551–4552 | 
| Holocene calendar | 11451 | 
| Igbo calendar | 451–452 | 
| Iranian calendar | 829–830 | 
| Islamic calendar | 854–855 | 
| Japanese calendar | Hōtoku 3 (宝徳3年) | 
| Javanese calendar | 1366–1367 | 
| Julian calendar | 1451 MCDLI | 
| Korean calendar | 3784 | 
| Minguo calendar | 461 before ROC 民前461年 | 
| Nanakshahi calendar | −17 | 
| Thai solar calendar | 1993–1994 | 
| Tibetan calendar | 阳金马年 (male Iron-Horse) 1577 or 1196 or 424 — to — 阴金羊年 (female Iron-Goat) 1578 or 1197 or 425 | 
Year 1451 (MCDLI) was a common year starting on Friday of the Julian calendar.