| Years |
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| Millennium |
| 1st millennium BC |
| Centuries |
| Decades |
| Years |
| 45 BC by topic |
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| Arts, history, and science |
| Countries |
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| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
Year 45 BC was either a common year starting on Thursday, Friday or Saturday or a leap year starting on Friday or Saturday and the first year of the Julian calendar. At the time, it was known as the Year of the Consulship of Caesar without Colleague.
Events
- Julius Caesar defeats the Pompeian forces of Titus Labienus and Pompey the younger in the Battle of Munda
- Possible first year of the Azes I Era
Births
- Iullus Antonius, son of Mark Antony and Fulvia (d. 2 BC)
- Wang Mang, usurper of the Han Dynasty and Emperor of the Xin Dynasty (d. 23)
Deaths
- Tullia, daughter of Cicero (b. 79 BC or 78 BC)
- Titus Labienus (b. c. 100 BC)
- Publius Attius Varus
- Gnaeus Pompeius, son of Pompey the Great (b. c. 75 BC)
- Quintus Fabius Maximus