120s BC

• The Kingdom of Pergamon becomes the Roman Province of Asia upon the defeat of Aristonicus, pretender to the Attalid throne, by M. Perperna.
• C. Sempronius Tuditanus celebrates his triumph over the Iapydes of Illyria.
• Scipio Aemilianus, victor of Carthage is possibly assassinated by his enemies in Rome.

• Battle of Ecbatana: The Seleucid King Antiochus VII Sidetes is defeated and killed by the Parthians under Phraates II, ending Seleucid control over Media or Mesopotamia.
• Having been freed by the Parthians, Demetrius II of Syria recovers the throne of the Seleucid Empire.

• Emperor Wu of the Han dynasty launches his first offensive into the northern steppe.

• Crates of Tarsus succeeds Carneades as head of the Academy in Athens.

• Hipparchus publishes his catalog of stars.
• Total solar eclipse, used by Hipparchus to estimate distance to the moon.

== {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}} == {{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}} == {{trim|{{transcluded section|{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}}} {{#section-h::{{dr|y|y|{{1x|-}}{{{year}}}0|{{1x|-}}{{{1}}}|na}}|Events}}}}

== {{ucfirst:{{{1}}}}} == {{preprocess|{{((}}transcluding articles {{!}} {{for loop|{{!}}|call=Year article|pc1n=1|pc1v={{{decade}}}0|pv=2|-9|-8|-7|-6|-5|-4|-3|-2|-1}} {{!}} {{#ifeq:{{{decade}}}|-0|{{void|There is no BC year 0}}|{{Year article|{{{decade}}}0}}}} {{))}}}} {{for loop| |call=Transclude {{{1}}}|{{{decade}}}9|{{{decade}}}8|{{{decade}}}7|{{{decade}}}6|{{{decade}}}5|{{{decade}}}4|{{{decade}}}3|{{{decade}}}2|{{{decade}}}1}} {{#ifeq:{{{decade}}}|-0|{{void|There is no BC year 0}}| {{Transclude {{{1}}}|{{{decade}}}0}} }} == {{ucfirst:{{{1}}}}} == {{preprocess|{{((}}transcluding articles {{!}} {{for loop|{{!}}|call=Year article|pc1n=1|pc1v={{{decade}}}0|pv=2|-9|-8|-7|-6|-5|-4|-3|-2|-1}} {{!}} {{#ifeq:{{{decade}}}|-0|{{void|There is no BC year 0}}|{{Year article|{{{decade}}}0}}}} {{))}}}} {{for loop| |call=Transclude {{{1}}}|{{{decade}}}9|{{{decade}}}8|{{{decade}}}7|{{{decade}}}6|{{{decade}}}5|{{{decade}}}4|{{{decade}}}3|{{{decade}}}2|{{{decade}}}1}} {{#ifeq:{{{decade}}}|-0|{{void|There is no BC year 0}}| {{Transclude {{{1}}}|{{{decade}}}0}} }}