|545 by topic|
|Ab urbe condita||1298|
|Balinese saka calendar||466–467|
|Chinese calendar||甲子年 (Wood Rat)|
3241 or 3181
— to —
乙丑年 (Wood Ox)
3242 or 3182
|- Vikram Samvat||601–602|
|- Shaka Samvat||466–467|
|- Kali Yuga||3645–3646|
|Iranian calendar||77 BP – 76 BP|
|Islamic calendar||79 BH – 78 BH|
|Minguo calendar||1367 before ROC|
|Seleucid era||856/857 AG|
|Thai solar calendar||1087–1088|
671 or 290 or −482
— to —
672 or 291 or −481
Year 545 (DXLV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 545 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.
- Emperor Justinian I sends Narses, Byzantine general, to the rulers of the Heruli, to recruit troops for the campaigns in Italy and Syria.
- Gothic War: King Totila establishes his military base at Tivoli (Central Italy), and prepares a campaign to reconquer the region of Latium.
- King Khosrau I signs a five year truce with the Byzantine Empire, but war continues to ravage the Caucasus region, especially in Armenia.
- The monastery of Clonmacnoise is founded by Ciarán Mac a tSaor on the River Shannon (approximate date).
- The Synod of Brefi is held at Llanddewi Brefi, to condemn the Pelagian heresy. Dubricius, archbishop of South Wales, resigns his position in favour of David (approximate date).
- Abd Allah ibn Abd al Muttalib, father of Muhammad (d. 570)
- Fei Di, emperor of Northern Qi (d. 561)
- Peter, Byzantine general (d. 602)
- October 12 – Mobhí Clárainech, Irish abbot and saint
- Stotzas, Byzantine rebel leader
- Approximate date
- Procopius. History. XXV. 26 Vol. IV 261