|Millennium:||1st millennium BC|
|550 BC by topic|
|Gregorian calendar||550 BC
|Ab urbe condita||204|
|Ancient Egypt era||XXVI dynasty, 115|
|- Pharaoh||Amasis II, 21|
|Ancient Greek era||57th Olympiad, year 3|
|Balinese saka calendar||N/A|
|Chinese calendar||庚戌年 (Metal Dog)
2147 or 2087
— to —
辛亥年 (Metal Pig)
2148 or 2088
|Coptic calendar||−833 – −832|
|Ethiopian calendar||−557 – −556|
|- Vikram Samvat||−493 – −492|
|- Shaka Samvat||N/A|
|- Kali Yuga||2551–2552|
|Iranian calendar||1171 BP – 1170 BP|
|Islamic calendar||1207 BH – 1206 BH|
|Minguo calendar||2461 before ROC
|Thai solar calendar||−7 – −6|
−423 or −804 or −1576
— to —
−422 or −803 or −1575
|Wikimedia Commons has media related to 550 BC.|
The year 550 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 204 Ab urbe condita. The denomination 550 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.
- Colonization of Greeks ends (approximate date).
- The Achaemenid Empire is established.
- The Kingdom of Colchis is established.
- Abdera is destroyed by the Thracians.
- The Temple of Artemis completed in Ephesus.
- Temple of Hera I, Paestum, Italy, is built (approximate date).
- Siddhartha Gautama founded Buddhism in Northern India after achieving enlightenment after six years of practicing penance and meditation.
- Aristodemus of Cumae, tyrant of Cumae
- Hecataeus of Miletus, an early Greek historian
- Miltiades, renowned Olympic chariot-racer
- Epicharmus, Greek poet
- Arcesilaus II of Cyrene, the fourth Greek Cyrenaean King and a member of the Battiad dynasty. He was stangled by Learchus