|Millennium:||1st millennium BC|
|Centuries:||6th century BC – 5th century BC – 4th century BC|
|Decades:||520s BC 510s BC 500s BC – 490s BC – 480s BC 470s BC 460s BC|
|Years:||498 BC 497 BC 496 BC – 495 BC – 494 BC 493 BC 492 BC|
|495 BC by topic|
|Gregorian calendar||495 BC|
|Ab urbe condita||259|
|Ancient Egypt era||XXVII dynasty, 31|
|- Pharaoh||Darius I of Persia, 27|
|Ancient Greek era||71st Olympiad, year 2|
|Chinese calendar||乙巳年 (Wood Snake)
2202 or 2142
— to —
丙午年 (Fire Horse)
2203 or 2143
|Coptic calendar||−778 – −777|
|Ethiopian calendar||−502 – −501|
|- Vikram Samvat||−438 – −437|
|- Shaka Samvat||N/A|
|- Kali Yuga||2607–2608|
|Iranian calendar||1116 BP – 1115 BP|
|Islamic calendar||1150 BH – 1149 BH|
|Minguo calendar||2406 before ROC
|Thai solar calendar||48–49|
|Wikimedia Commons has media related to 495 BC.|
Year 495 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Sabinus and Priscus (or, less frequently, year 259 Ab urbe condita). The denomination 495 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.
- A temple is built on the Circus Maximus, between the Aventine and Palatine hills, in Rome, in honour of the god Mercury and was dedicated on 15 May.
- The number of Roman tribes is increased to 21.
- Additional colonists were sent to the colony at Signia.
- The Volsci launch an invasion against Rome, but are defeated, and in retalliation Rome plunders Suessa Pometia.
- Roman troops defeat an invading force of Sabines.
- Roman troops defeat an army of the Aurunci near the town of Aricia.
- The beginning of discord between the plebs and patricians leading to the first secession of the plebs.
- King Fuchai of Wu ascends to the throne after his father, King Helü of Wu, reigning as the last king of Wu until 473 BC.