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|Millennium:||1st millennium BC|
|Centuries:||6th century BC – 5th century BC – 4th century BC|
|Decades:||470s BC 460s BC 450s BC – 440s BC – 430s BC 420s BC 410s BC|
|Years:||451 BC 450 BC 449 BC – 448 BC – 447 BC 446 BC 445 BC|
|448 BC by topic|
|Gregorian calendar||448 BC
|Ab urbe condita||306|
|Ancient Egypt era||XXVII dynasty, 78|
|- Pharaoh||Artaxerxes I of Persia, 18|
|Ancient Greek era||83rd Olympiad (victor)¹|
|Chinese calendar||壬辰年 (Water Dragon)
2249 or 2189
— to —
癸巳年 (Water Snake)
2250 or 2190
|Coptic calendar||−731 – −730|
|Ethiopian calendar||−455 – −454|
|- Vikram Samvat||−391 – −390|
|- Shaka Samvat||N/A|
|- Kali Yuga||2654–2655|
|Iranian calendar||1069 BP – 1068 BP|
|Islamic calendar||1102 BH – 1101 BH|
|Minguo calendar||2359 before ROC
|Thai solar calendar||95–96|
|Wikimedia Commons has media related to 448 BC.|
Year 448 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Coritinesanus and Caeliomontanus (or, less frequently, year 306 Ab urbe condita). The denomination 448 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 leads the Athenian army against Delphi to restore the sanctuary of the oracle of Delphi to Phocis.
- The Athenians begin constructing the middle component of the Long Walls from their city to the port city of Piraeus.
- Following the co-optation of two patricians to the office of Tribune of the Plebs, the tribune Lucius Trebonius Asper introduces the Lex Trebonia, a law forbidding tribunes from co-opting their colleagues in the future.