|Millennium:||1st millennium BC|
|24 BC by topic|
|Gregorian calendar||24 BC|
|Ab urbe condita||730|
|Ancient Greek era||189th Olympiad (victor)¹|
|Balinese saka calendar||N/A|
|Chinese calendar||丙申年 (Fire Monkey)|
2673 or 2613
— to —
丁酉年 (Fire Rooster)
2674 or 2614
|Coptic calendar||−307 – −306|
|Ethiopian calendar||−31 – −30|
|- Vikram Samvat||33–34|
|- Shaka Samvat||N/A|
|- Kali Yuga||3077–3078|
|Iranian calendar||645 BP – 644 BP|
|Islamic calendar||665 BH – 664 BH|
|Julian calendar||24 BC|
|Minguo calendar||1935 before ROC|
|Seleucid era||288/289 AG|
|Thai solar calendar||519–520|
103 or −278 or −1050
— to —
104 or −277 or −1049
Year 24 BC was either a common year starting on Thursday, Friday or Saturday or a leap year starting on 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 Thursday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Augustus and Flaccus (or, less frequently, year 730 Ab urbe condita). The denomination 24 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.
- Caesar Augustus becomes Roman Consul for the tenth time. His partner is Gaius Norbanus Flaccus.
- Augustus founds the city of Nicopolis in Egypt to commemorate his final victory over Mark Antony.
- Herod the Great marries for a third time, to Mariamne II, after a 4-year hiatus from family life (after putting to death his 2nd wife Mariamne I).