|Millennium:||1st millennium BC|
|111 BC by topic|
|Gregorian calendar||111 BC|
|Ab urbe condita||643|
|Ancient Egypt era||XXXIII dynasty, 213|
|- Pharaoh||Ptolemy IX Lathyros, 6|
|Ancient Greek era||167th Olympiad, year 2|
|Balinese saka calendar||N/A|
|Chinese calendar||己巳年 (Earth Snake)|
2586 or 2526
— to —
庚午年 (Metal Horse)
2587 or 2527
|Coptic calendar||−394 – −393|
|Ethiopian calendar||−118 – −117|
|- Vikram Samvat||−54 – −53|
|- Shaka Samvat||N/A|
|- Kali Yuga||2990–2991|
|Iranian calendar||732 BP – 731 BP|
|Islamic calendar||755 BH – 753 BH|
|Minguo calendar||2022 before ROC|
|Seleucid era||201/202 AG|
|Thai solar calendar||432–433|
16 or −365 or −1137
— to —
17 or −364 or −1136
Year 111 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Serapio and Bestia (or, less frequently, year 643 Ab urbe condita). The denomination 111 BC 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.
- The city of Rome is devastated by fire.
- Jugurtha, king of Numidia, bribes the commander Lucius Calpurnius Bestia and Roman friends to secure easy terms. He is given a safe conduct to Rome in order to account for his actions in the Roman Senate. Jugurtha contemptuously bribes his way through all difficulties.
- The Han Empire annexes the Kingdom of Nanyue, and thereby extends its territory to modern-day North Vietnam.
- The remaining territory of Minyue, known as Dongyue, is annexed by the Han Dynasty during its expansion southward.
- During the reign of Emperor Wu of the Han Dynasty, Guilin is named Shi An Prefecture.
- Jiuquan in China is founded as a military outpost on the Silk Road to Central Asia.