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.

Millennium: 1st millennium BC
Centuries: 2nd century BC1st century BC1st century
Decades: 70s BC  60s BC  50s BC  – 40s BC –  30s BC  20s BC  10s BC
Years: 48 BC 47 BC 46 BC45 BC44 BC 43 BC 42 BC
45 BC in other calendars
Gregorian calendar45 BC
XLIV BC
Ab urbe condita709
Ancient Egypt eraXXXIII dynasty, 279
- PharaohCleopatra VII, 7
Ancient Greek era183rd Olympiad, year 4
Assyrian calendar4706
Balinese saka calendarN/A
Bengali calendar−637
Berber calendar906
Buddhist calendar500
Burmese calendar−682
Byzantine calendar5464–5465
Chinese calendar乙亥(Wood Pig)
2652 or 2592
    — to —
丙子年 (Fire Rat)
2653 or 2593
Coptic calendar−328 – −327
Discordian calendar1122
Ethiopian calendar−52 – −51
Hebrew calendar3716–3717
Hindu calendars
 - Vikram Samvat12–13
 - Shaka SamvatN/A
 - Kali Yuga3056–3057
Holocene calendar9956
Iranian calendar666 BP – 665 BP
Islamic calendar686 BH – 685 BH
Javanese calendarN/A
Julian calendar45 BC
XLIV BC
Korean calendar2289
Minguo calendar1956 before ROC
民前1956年
Nanakshahi calendar−1512
Seleucid era267/268 AG
Thai solar calendar498–499
Tibetan calendar阴木猪年
(female Wood-Pig)
82 or −299 or −1071
    — to —
阳火鼠年
(male Fire-Rat)
83 or −298 or −1070

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