| Millennium: | 3rd millennium |
|---|---|
| Centuries: | 20th century – 21st century – 22nd century |
| Decades: | 2020s 2030s 2040s – 2050s – 2060s 2070s 2080s |
| Years: | 2048 2049 2050 – 2051 – 2052 2053 2054 |
| Gregorian calendar | 2051 MMLI |
| Ab urbe condita | 2804 |
| Armenian calendar | 1500 ԹՎ ՌՇ |
| Bahá'í calendar | 207 – 208 |
| Bengali calendar | 1458 |
| Berber calendar | 3001 |
| Buddhist calendar | 2595 |
| Burmese calendar | 1413 |
| Byzantine calendar | 7559 – 7560 |
| Chinese calendar | 庚午年 (4687/4747) — to —
辛未年(4688/4748) |
| Coptic calendar | 1767 – 1768 |
| Ethiopian calendar | 2043 – 2044 |
| Hebrew calendar | 5811 – 5812 |
| Hindu calendars | |
| - Bikram Samwat | 2107 – 2108 |
| - Shaka Samvat | 1973 – 1974 |
| - Kali Yuga | 5152 – 5153 |
| Holocene calendar | 12051 |
| Iranian calendar | 1429 – 1430 |
| Islamic calendar | 1473 – 1474 |
| Japanese calendar | Heisei 63 (平成63年) |
| Korean calendar | 4384 |
| Thai solar calendar | 2594 |
| Unix time | 2556144000 – 2587679999 |
2051 (MMLI) will be a common year starting on Sunday of the Gregorian calendar.