| Millennium: | 1st millennium |
|---|---|
| Centuries: | 1st century – 2nd century – 3rd century |
| Decades: | 140s 150s 160s – 170s – 180s 190s 200s |
| Years: | 168 169 170 – 171 – 172 173 174 |
| 171 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 171 CLXXI |
| Ab urbe condita | 924 |
| Armenian calendar | N/A |
| Assyrian calendar | 4921 |
| Bahá'í calendar | -1673–-1672 |
| Bengali calendar | -422 |
| Berber calendar | 1121 |
| English Regnal year | N/A |
| Buddhist calendar | 715 |
| Burmese calendar | -467 |
| Byzantine calendar | 5679–5680 |
| Chinese calendar | 庚戌年閏十一月初七日 (2807/2867-intercalary 11-7) — to —
辛亥年十一月十七日(2808/2868-11-17) |
| Coptic calendar | -113–-112 |
| Ethiopian calendar | 163–164 |
| Hebrew calendar | 3931–3932 |
| Hindu calendars | |
| - Vikram Samvat | 227–228 |
| - Shaka Samvat | 93–94 |
| - Kali Yuga | 3272–3273 |
| Holocene calendar | 10171 |
| Iranian calendar | 451 BP – 450 BP |
| Islamic calendar | 465 BH – 464 BH |
| Japanese calendar | |
| Korean calendar | 2504 |
| Minguo calendar | 1741 before ROC 民前1741年 |
| Thai solar calendar | 714 |
Year 171 (CLXXI) 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 Severus and Herennianus (or, less frequently, year 924 Ab urbe condita). The denomination 171 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.