The year 545 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 209 Ab urbe condita. The denomination 545 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.

Millennium: 1st millennium BC
545 BC in various calendars
Gregorian calendar545 BC
Ab urbe condita209
Ancient Egypt eraXXVI dynasty, 120
- PharaohAmasis II, 26
Ancient Greek era58th Olympiad, year 4
Assyrian calendar4206
Balinese saka calendarN/A
Bengali calendar−1137
Berber calendar406
Buddhist calendar0
Burmese calendar−1182
Byzantine calendar4964–4965
Chinese calendar乙卯(Wood Rabbit)
2152 or 2092
    — to —
丙辰年 (Fire Dragon)
2153 or 2093
Coptic calendar−828 – −827
Discordian calendar622
Ethiopian calendar−552 – −551
Hebrew calendar3216–3217
Hindu calendars
 - Vikram Samvat−488 – −487
 - Shaka SamvatN/A
 - Kali Yuga2556–2557
Holocene calendar9456
Iranian calendar1166 BP – 1165 BP
Islamic calendar1202 BH – 1201 BH
Javanese calendarN/A
Julian calendarN/A
Korean calendar1789
Minguo calendar2456 before ROC
Nanakshahi calendar−2012
Thai solar calendar−2 – −1
Tibetan calendar阴木兔年
(female Wood-Rabbit)
−418 or −799 or −1571
    — to —
(male Fire-Dragon)
−417 or −798 or −1570

In the Buddhist calendar, it corresponds to the year 0, traditionally the year when the Buddha reached parinirvana. However, different traditions disagree about the actual year 0, with many placing it in the following year 544 BC instead.