|Millennium:||1st millennium BC|
|474 BC by topic|
|Gregorian calendar||474 BC|
|Ab urbe condita||280|
|Ancient Egypt era||XXVII dynasty, 52|
|- Pharaoh||Xerxes I of Persia, 12|
|Ancient Greek era||76th Olympiad, year 3|
|Balinese saka calendar||N/A|
|Chinese calendar||丙寅年 (Fire Tiger)|
2223 or 2163
— to —
丁卯年 (Fire Rabbit)
2224 or 2164
|Coptic calendar||−757 – −756|
|Ethiopian calendar||−481 – −480|
|- Vikram Samvat||−417 – −416|
|- Shaka Samvat||N/A|
|- Kali Yuga||2627–2628|
|Iranian calendar||1095 BP – 1094 BP|
|Islamic calendar||1129 BH – 1128 BH|
|Minguo calendar||2385 before ROC|
|Thai solar calendar||69–70|
−347 or −728 or −1500
— to —
−346 or −727 or −1499
Year 474 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Medullinus and Vulso (or, less frequently, year 280 Ab urbe condita). The denomination 474 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.
- Hiero I, tyrant of Syracuse, allied with naval forces from the maritime Greek cities of southern Italy defeats the Etruscan navy in the Battle of Cumae as the Etruscans try to capture the Greek city of Cumae. This victory marks the end of the Etruscan aggression against the Greeks in southern Italy and saves the Greeks of Campania from Etruscan domination.
- Taras signs an alliance with Rhegion, to counter the Messapians, Peucetians, and Lucanians, but the joint armies of the Tarentines and Rhegines are defeated near Kailia.
- Hiero builds Castello Aragonese on the island of Ischia.
- The Greek poet Pindar moves to Thebes after two years at the Sicilian Court of Hiero I of Syracuse. While at Thebes, he composes lyric odes to celebrate triumphs in the Olympic Games and other athletic events.
- Pandukabhaya of Anuradhapura, ruler of Sri Lanka