| Years |
|---|
| Millennium |
| 1st millennium BC |
| Centuries |
| Decades |
| Years |
| 45 BC by topic |
|---|
| Arts, history, and science |
| Countries |
|
|
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
| Gregorian calendar | 45 BC XLIV BC |
| Ab urbe condita | 709 |
| Ancient Egypt era | XXXIII dynasty, 279 |
| - Pharaoh | Cleopatra VII, 7 |
| Ancient Greek era | 183rd Olympiad, year 4 |
| Assyrian calendar | 4706 |
| Balinese saka calendar | N/A |
| Bengali calendar | −637 |
| Berber calendar | 906 |
| Buddhist calendar | 500 |
| Burmese calendar | −682 |
| Byzantine calendar | 5464–5465 |
| Chinese calendar | 乙亥年 (Wood Pig) 2652 or 2592 — to — 丙子年 (Fire Rat) 2653 or 2593 |
| Coptic calendar | −328 – −327 |
| Discordian calendar | 1122 |
| Ethiopian calendar | −52 – −51 |
| Hebrew calendar | 3716–3717 |
| Hindu calendars | |
| - Vikram Samvat | 12–13 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3056–3057 |
| Holocene calendar | 9956 |
| Iranian calendar | 666 BP – 665 BP |
| Islamic calendar | 686 BH – 685 BH |
| Javanese calendar | N/A |
| Julian calendar | 45 BC XLIV BC |
| Korean calendar | 2289 |
| Minguo calendar | 1956 before ROC 民前1956年 |
| Nanakshahi calendar | −1512 |
| Seleucid era | 267/268 AG |
| Thai solar calendar | 498–499 |
| Tibetan calendar | ཤིང་མོ་ཕག་ལོ་ (female Wood-Boar) 82 or −299 or −1071 — to — མེ་ཕོ་བྱི་བ་ལོ་ (male Fire-Rat) 83 or −298 or −1070 |
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.