Centuries:	3rd century BC - 2nd century BC - 1st century BC
Decades:	150s BC  140s BC  130s BC - 120s BC - 110s BC  100s BC  90s BC
Years:	124 BC 123 BC 122 BC - 121 BC - 120 BC 119 BC 118 BC

121 BC by topic

Politics

State leaders - Sovereign states

Birth and death categories

Births - Deaths

Establishments and disestablishments categories

Establishments - Disestablishments v • d • e

121 BC in other calendars

Gregorian calendar	121 BC
Ab urbe condita	633
Armenian calendar	N/A
Bahá'í calendar	-1964 – -1963
Berber calendar	830
Buddhist calendar	424
Burmese calendar	-758
Byzantine calendar	5388 – 5389
Chinese calendar	[[Sexagenary cycle|]]年 (2516/2576) — to — [[Sexagenary cycle|]]年 (2517/2577)
Coptic calendar	-404 – -403
Ethiopian calendar	-128 – -127
Hebrew calendar	3640 – 3641
Hindu calendars
- Vikram Samvat	-65 – -64
- Shaka Samvat	N/A
- Kali Yuga	2981 – 2982
Holocene calendar	9880
Iranian calendar	742 BP – 741 BP
Islamic calendar	765 BH – 764 BH
Japanese calendar
Korean calendar	2213
Thai solar calendar	423
v • d • e

Events

By place

Rome

• The Roman Senate passes the motion senatus consultum ultimum, which the consul Lucius Opimius interprets as giving him unlimited power to preserve the republic. He gathers an armed force of Senators and their supporters to confront Gaius Gracchus. A pitched battle is fought inside Rome, resulting in the death of Gracchus and many of his followers.
• A tribunal is established in Rome that executes 3000 followers of Gracchus.
• Consul Q. Fabius Maximus, allied with the Aedui, defeated the Arverni and Allobroges in Transalpine Gaul, thus establishing the province for Rome.

Asia

• Led by General Ho Chu-ping, the Chinese defeat the Hsiung-nu.

Births

• Publius Sulpicius Rufus, tribune of the plebs (d. 88 BC)
• Sertorius, Roman general (d. 72 BC)

Deaths

• Gaius Gracchus
• M. Fulvius Flaccus (b. 154 BC)
• Cleopatra Thea (failed attempt to poison her stepson) (b. c. 164 BC)