|Millennium:||1st millennium BC|
|Centuries:||2nd century BC – 1st century BC – 1st century|
|Decades:||30s BC 20s BC 10s BC – 0s BC – 0s 10s 20s|
|Years:||12 BC 11 BC 10 BC – 9 BC – 8 BC 7 BC 6 BC|
|9 BC by topic|
|Gregorian calendar||9 BC|
|Ab urbe condita||745|
|Bahá'í calendar||−1852 – −1851|
|English Regnal year||N/A|
|Chinese calendar||辛亥年 (Metal Pig)
2688 or 2628
— to —
壬子年 (Water Rat)
2689 or 2629
|Coptic calendar||−292 – −291|
|Ethiopian calendar||−16 – −15|
|- Vikram Samvat||48–49|
|- Shaka Samvat||N/A|
|- Kali Yuga||3093–3094|
|Igbo calendar||−1008 – −1007|
|Iranian calendar||630 BP – 629 BP|
|Islamic calendar||649 BH – 648 BH|
|Julian calendar||9 BC|
|Minguo calendar||1920 before ROC
|Thai solar calendar||535|
|Wikimedia Commons has media related to 9 BC.|
Year 9 BC was either a common year starting on Wednesday, Thursday or Friday or a leap year starting on Thursday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a leap year starting on Monday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Drusus and Crispinus (or, less frequently, year 745 Ab urbe condita). The denomination 9 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.
- Pannonia is incorporated in the Roman Empire as part of Illyria.
- The Ara Pacis ("Altar of Augustan Peace"), voted by the Senate four years earlier, is dedicated.
- Nero Claudius Drusus begins a campaign against the Marcomanni, but dies soon after a fall from his horse.
- Tiberius Claudius Nero continues the conquest of Germania.