| Millennium: | 1st millennium |
|---|---|
| Centuries: | 1st century BC – 1st century – 2nd century |
| Decades: | 10s BC 0s BC 0s – 10s – 20s 30s 40s |
| Years: | 15 16 17 – 18 – 19 20 21 |
| 18 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 18 XVIII |
| Ab urbe condita | 771 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1826 – -1825 |
| Bengali calendar | -575 |
| Berber calendar | 968 |
| Buddhist calendar | 562 |
| Burmese calendar | -620 |
| Byzantine calendar | 5526 – 5527 |
| Chinese calendar | 丁丑年十二月廿五日 (2654/2714-12-25) — to —
戊寅年正月初五日(2655/2715-1-5) |
| Coptic calendar | -266 – -265 |
| Ethiopian calendar | 10 – 11 |
| Hebrew calendar | 3778 – 3779 |
| Hindu calendars | |
| - Bikram Samwat | 74 – 75 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3119 – 3120 |
| Holocene calendar | 10018 |
| Iranian calendar | 604 BP – 603 BP |
| Islamic calendar | 623 BH – 622 BH |
| Japanese calendar | |
| Korean calendar | 2351 |
| Thai solar calendar | 561 |
Year 18 (XVIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.