|Millennium:||1st millennium BC|
|Centuries:||2nd century BC – 1st century BC – 1st century|
|Decades:||90s BC 80s BC 70s BC – 60s BC – 50s BC 40s BC 30s BC|
|Years:||71 BC 70 BC 69 BC – 68 BC – 67 BC 66 BC 65 BC|
|68 BC by topic|
|Gregorian calendar||68 BC|
|Ab urbe condita||686|
|Ancient Egypt era||XXXIII dynasty, 256|
|- Pharaoh||Ptolemy XII Auletes, 13|
|Ancient Greek era||178th Olympiad (victor)¹|
|Chinese calendar||壬子年 (Water Rat)
2629 or 2569
— to —
癸丑年 (Water Ox)
2630 or 2570
|Coptic calendar||−351 – −350|
|Ethiopian calendar||−75 – −74|
|- Vikram Samvat||−11 – −10|
|- Shaka Samvat||N/A|
|- Kali Yuga||3034–3035|
|Iranian calendar||689 BP – 688 BP|
|Islamic calendar||710 BH – 709 BH|
|Minguo calendar||1979 before ROC
|Seleucid era||244/245 AG|
|Thai solar calendar||475–476|
|Wikimedia Commons has media related to 68 BC.|
Year 68 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Metellus/Vatia and Rex (or, less frequently, year 686 Ab urbe condita). The denomination 68 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.
- Consuls: Lucius Caecilius Metellus and Quintus Marcius Rex.
- October 6 – Lucius Lucullus defeats Tigranes II of Armenia in the Battle of Artaxata.
- Gaius Antonius Hybrida elected praetor.
- Ostia, the harbour city of Rome, is sacked by pirates. The port is set on fire and the consular war fleet is destroyed.
- Princess Arsinoe IV of Egypt, daughter of Ptolemy XII of Egypt and probably Cleopatra V of Egypt (or 67 BC) (d. 41 BC)
- Antiochus of Ascalon, Greek philosopher (b. c. 130 BC)
- Cornelia, wife of Julius Caesar (b. 94 BC)
- Huo Guang, official of the western Han Dynasty of China