|Millennium:||1st millennium BC|
|19 BC by topic|
|Gregorian calendar||19 BC|
|Ab urbe condita||735|
|Ancient Greek era||190th Olympiad, year 2|
|Balinese saka calendar||N/A|
|Chinese calendar||辛丑年 (Metal Ox)|
2678 or 2618
— to —
壬寅年 (Water Tiger)
2679 or 2619
|Coptic calendar||−302 – −301|
|Ethiopian calendar||−26 – −25|
|- Vikram Samvat||38–39|
|- Shaka Samvat||N/A|
|- Kali Yuga||3082–3083|
|Iranian calendar||640 BP – 639 BP|
|Islamic calendar||660 BH – 659 BH|
|Julian calendar||19 BC|
|Minguo calendar||1930 before ROC|
|Seleucid era||293/294 AG|
|Thai solar calendar||524–525|
108 or −273 or −1045
— to —
109 or −272 or −1044
Year 19 BC was either a common year starting on Thursday, Friday or Saturday or a leap year starting on Thursday or Friday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Wednesday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Saturninus and Vespillo (or, less frequently, year 735 Ab urbe condita). The denomination 19 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the main method in Europe for naming years.
- In Rome, Lucius Cornelius Balbus receives the honor of a triumph on the Forum Romanum, for his victories over the Garamantes in Africa.
- Marcus Vipsanius Agrippa completes the Aqua Virgo; the aqueduct is 21 kilometers in length and supplies the city of Rome with about 100,000,000 liters of water every day.
- The Cantabrians, living on the northernmost coast of Spain, are brought under Roman control. The region is completely subdued until 16 BC.