|Millennium:||1st millennium BC|
|445 BC by topic|
|Gregorian calendar||445 BC|
|Ab urbe condita||309|
|Ancient Egypt era||XXVII dynasty, 81|
|- Pharaoh||Artaxerxes I of Persia, 21|
|Ancient Greek era||83rd Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||乙未年 (Wood Goat)|
2252 or 2192
— to —
丙申年 (Fire Monkey)
2253 or 2193
|Coptic calendar||−728 – −727|
|Ethiopian calendar||−452 – −451|
|- Vikram Samvat||−388 – −387|
|- Shaka Samvat||N/A|
|- Kali Yuga||2656–2657|
|Iranian calendar||1066 BP – 1065 BP|
|Islamic calendar||1099 BH – 1098 BH|
|Minguo calendar||2356 before ROC|
|Thai solar calendar||98–99|
−318 or −699 or −1471
— to —
−317 or −698 or −1470
Year 445 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Augurinus and Philo (or, less frequently, year 309 Ab urbe condita). The denomination 445 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.
- Pericles, concerned over the draining effect of years of war on Athenian manpower, looks for peace with the support of the Assembly. Athenian diplomat, Callias, goes to Sparta and after much bargaining arranges a peace treaty with Sparta and her Peloponnesian allies, thus extending the 5 year truce of 451 BC for another 30 years. According to this treaty, Megara is to be returned to the Peloponnesian League, Troezen and Achaea become independent, Aegina is to become a tributary to Athens but autonomous, and disputes are to be settled by arbitration. Each party agrees to respect the alliances of the other.
- The Temple of Poseidon is completed south of Athens at Cape Sunion.
- A new law, the Lex Canuleia removes the ban on inter-marriage of the Roman classes, i.e. plebeian with patrician.
- The Plebeians demand the right to stand for election as consul but the Roman senate refused to grant them this right. Ultimately, a compromise is reached, and consular command authority is granted to Consular Tribunes ("Military Tribunes with Consular powers" or tribuni militares consulari potestate).
- Antisthenes, Athenian philosopher (d. c. 365 BC)