Year 40 BC was either a common year starting on Thursday, Friday or Saturday or a leap year starting on Thursday or Friday of the Julian calendar. At the time, it was known as the Year of the Consulship of Calvinus and Pollio.

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: 43 BC 42 BC 41 BC40 BC39 BC 38 BC 37 BC
40 BC in other calendars
Gregorian calendar40 BC
XXXIX BC
Ab urbe condita714
Ancient Egypt eraXXXIII dynasty, 284
- PharaohCleopatra VII, 12
Ancient Greek era185th Olympiad (victor
Assyrian calendar4711
Balinese saka calendarN/A
Bengali calendar−632
Berber calendar911
Buddhist calendar505
Burmese calendar−677
Byzantine calendar5469–5470
Chinese calendar庚辰(Metal Dragon)
2657 or 2597
    — to —
辛巳年 (Metal Snake)
2658 or 2598
Coptic calendar−323 – −322
Discordian calendar1127
Ethiopian calendar−47 – −46
Hebrew calendar3721–3722
Hindu calendars
 - Vikram Samvat17–18
 - Shaka SamvatN/A
 - Kali Yuga3061–3062
Holocene calendar9961
Iranian calendar661 BP – 660 BP
Islamic calendar681 BH – 680 BH
Javanese calendarN/A
Julian calendar40 BC
XXXIX BC
Korean calendar2294
Minguo calendar1951 before ROC
民前1951年
Nanakshahi calendar−1507
Seleucid era272/273 AG
Thai solar calendar503–504
Tibetan calendar阳金龙年
(male Iron-Dragon)
87 or −294 or −1066
    — to —
阴金蛇年
(female Iron-Snake)
88 or −293 or −1065

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