171 BC

Millennium:	1st millennium BC
Centuries:	3rd century BC – 2nd century BC – 1st century BC
Decades:	200s BC 190s BC 180s BC – 170s BC – 160s BC 150s BC 140s BC
Years:	174 BC 173 BC 172 BC – 171 BC – 170 BC 169 BC 168 BC

171 BC by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishments and disestablishments categories
Establishments – Disestablishments

**171 BC in other calendars**
Gregorian calendar	171 BC
Ab urbe condita	583
Armenian calendar	N/A
Bahá'í calendar	-2014 – -2013
Bengali calendar	-763
Berber calendar	780
Buddhist calendar	374
Burmese calendar	-808
Byzantine calendar	5338 – 5339
Chinese calendar	[[Sexagenary cycle\|]]年 (2466/2526) — to — [[Sexagenary cycle\|]]年 (2467/2527)
Coptic calendar	-454 – -453
Ethiopian calendar	-178 – -177
Hebrew calendar	3590 – 3591
Hindu calendars
- Bikram Samwat	-114 – -113
- Shaka Samvat	N/A
- Kali Yuga	2931 – 2932
Holocene calendar	9830
Iranian calendar	792 BP – 791 BP
Islamic calendar	816 BH – 815 BH
Japanese calendar
Korean calendar	2163
Thai solar calendar	373

Events

Epirus joins Macedonia in the latter's fight against Rome. However, the Greek leagues remain neutral.
Thanks to the efforts of Eumenes II of Pergamum while in Rome, the Romans declare war on Macedonia and send troops to Thessaly, thus beginning the Third Macedonian War. In the resulting Battle of Callicinus the Macedonians, led by their king, Perseus, are victorious over a Roman force led by consul Publius Licinius Crassus.

The first Roman colony outside Italy is founded at Carteia in southern Hispania after Iberian-born descendants of Roman soldiers appear before the Roman Senate to request a town to live in and are given Carteia, which is named Colonia Libertinorum Carteia.
Lucius Postumius Albinus is sent by Rome as an ambassador to King Masinissa of Numidia, and to the Carthaginians in order to raise troops for the war against Perseus of Macedonia.