|Millennium:||1st millennium BC|
|Centuries:||6th century BC – 5th century BC – 4th century BC|
|Decades:||440s BC 430s BC 420s BC – 410s BC – 400s BC 390s BC 380s BC|
|Years:||422 BC 421 BC 420 BC – 419 BC – 418 BC 417 BC 416 BC|
|419 BC by topic|
|Gregorian calendar||419 BC|
|Ab urbe condita||335|
|Bahá'í calendar||−2262 – −2261|
|English Regnal year||N/A|
|Chinese calendar||辛酉年 (Metal Rooster)
2278 or 2218
— to —
壬戌年 (Water Dog)
2279 or 2219
|Coptic calendar||−702 – −701|
|Ethiopian calendar||−426 – −425|
|- Vikram Samvat||−362 – −361|
|- Shaka Samvat||N/A|
|- Kali Yuga||2683–2684|
|Igbo calendar||−1418 – −1417|
|Iranian calendar||1040 BP – 1039 BP|
|Islamic calendar||1072 BH – 1071 BH|
|Minguo calendar||2330 before ROC
|Thai solar calendar||125|
|Wikimedia Commons has media related to 419 BC.|
Year 419 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Tribunate of Lanatus, Rutilus, Tricipitinus and Axilla (or, less frequently, year 335 Ab urbe condita). The denomination 419 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.
- Despite the Peace of Nicias still being in effect, Sparta's King Agis II gathers a strong army at Philus and descends upon Argos by marching at night from the north. His allied Boeotian forces fail him, but he is able to conclude a treaty with Argos.
- Euripides' play Andromache is performed.
- Sophocles' play Electra is performed. The play takes its theme from The Libation Bearers by Aeschylus.