|Millennium:||1st millennium BC|
|Centuries:||2nd century BC – 1st century BC – 1st century|
|Decades:||100s BC 90s BC 80s BC – 70s BC – 60s BC 50s BC 40s BC|
|Years:||73 BC 72 BC 71 BC – 70 BC – 69 BC 68 BC 67 BC|
|70 BC by topic|
|Gregorian calendar||70 BC|
|Ab urbe condita||684|
|Bahá'í calendar||−1913 – −1912|
|English Regnal year||N/A|
|Chinese calendar||庚戌年 (Metal Dog)
2627 or 2567
— to —
辛亥年 (Metal Pig)
2628 or 2568
|Coptic calendar||−353 – −352|
|Ethiopian calendar||−77 – −76|
|- Vikram Samvat||−13 – −12|
|- Shaka Samvat||N/A|
|- Kali Yuga||3032–3033|
|Igbo calendar||−1069 – −1068|
|Iranian calendar||691 BP – 690 BP|
|Islamic calendar||712 BH – 711 BH|
|Minguo calendar||1981 before ROC
|Thai solar calendar||474|
|Wikimedia Commons has media related to 70 BC.|
Year 70 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Magnus and Dives (or, less frequently, year 684 Ab urbe condita). The denomination 70 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.
- August – In Rome, Cicero prosecutes former governor Verres; Verres exiles himself to Marseille before the trial is over.
- The office of censor is reinstated in the Roman Republic.
- Lucullus captures Sinop, then invades Armenia.
- October 15 – Virgil, Roman poet (d. 19 BC)
- December – Cleopatra VII of Egypt (or January 69 BC) (d. 30 BC)
- Publius Cornelius Dolabella, Roman general (d. 43 BC)
- Maecenas, Roman politician and patron (d. 8 BC)