| Millennium: | 1st millennium |
|---|---|
| Centuries: | 1st century BC – 1st century – 2nd century |
| Decades: | 50s 60s 70s – 80s – 90s 100s 110s |
| Years: | 78 79 80 – 81 – 82 83 84 |
| 81 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 81 LXXXI |
| Ab urbe condita | 834 |
| Armenian calendar | N/A |
| Assyrian calendar | 4831 |
| Bahá'í calendar | -1763–-1762 |
| Bengali calendar | -512 |
| Berber calendar | 1031 |
| English Regnal year | N/A |
| Buddhist calendar | 625 |
| Burmese calendar | -557 |
| Byzantine calendar | 5589–5590 |
| Chinese calendar | 庚辰年十二月初二日 (2717/2777-12-2) — to —
辛巳年十一月十二日(2718/2778-11-12) |
| Coptic calendar | -203–-202 |
| Ethiopian calendar | 73–74 |
| Hebrew calendar | 3841–3842 |
| Hindu calendars | |
| - Vikram Samvat | 137–138 |
| - Shaka Samvat | 3–4 |
| - Kali Yuga | 3182–3183 |
| Holocene calendar | 10081 |
| Iranian calendar | 541 BP – 540 BP |
| Islamic calendar | 558 BH – 557 BH |
| Japanese calendar | |
| Korean calendar | 2414 |
| Minguo calendar | 1831 before ROC 民前1831年 |
| Thai solar calendar | 624 |
Year 81 (LXXXI) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Silva and Pollio (or, less frequently, year 834 Ab urbe condita). The denomination 81 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.