|Millennium:||1st millennium BC|
|Centuries:||4th century BC – 3rd century BC – 2nd century BC|
|Decades:||230s BC 220s BC 210s BC – 200s BC – 190s BC 180s BC 170s BC|
|Years:||211 BC 210 BC 209 BC – 208 BC – 207 BC 206 BC 205 BC|
|208 BC by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Gregorian calendar||208 BC
|Ab urbe condita||546|
|English Regnal year||N/A|
— to —癸巳年
|- Vikram Samvat||-151–-150|
|- Shaka Samvat||N/A|
|- Kali Yuga||2894–2895|
|- Ǹrí Ìgbò||-1207–-1206|
|Iranian calendar||829 BP – 828 BP|
|Islamic calendar||854 BH – 853 BH|
|Juche calendar||N/A (before 1912)|
|Minguo calendar||2119 before ROC
|Thai solar calendar||336|
|Wikimedia Commons has media related to: 208 BC|
Year 208 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Marcellus and Crispinus (or, less frequently, year 546 Ab urbe condita). The denomination 208 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.
 By place
 Roman Republic
- The Romans under Publius Cornelius Scipio defeat the Carthaginians under their commander Hasdrubal Barca at Baecula (Bailen) in Baetica. As a result, Hasdrubal Barca decides to cross the Pyrenees with his remaining troops into Transalpine Gaul, with the intention of joining his brother Hannibal in Italy.
- The Roman general Marcus Claudius Marcellus is killed in battle while fighting Hannibal inconclusively near Venusia, Apulia.
- Hannibal destroys a Roman force engaged in the siege of Locri Epizephyri.
 Seleucid Empire
- Antiochus III advances into Bactria, which is ruled by the Greco-Bactrian king Euthydemus I, and again meets with success. After resisting a siege of his capital Bactra (Balkh) by the Seleucids, Euthydemus obtains an honourable peace by which Antiochus promises Euthydemus' son Demetrius the hand of one of his daughters.
- The Chinese general Zhang Han of the Qin Dynasty pacifies a peasant rebellion led by Chen Sheng and Wu Guang, and then lays siege to the rebel city of Julu.
- Marcus Claudius Marcellus, Roman general who has captured Syracuse during the Second Punic War and has become known as "the sword of Rome" (b. 268 BC)
- Li Si, Chinese philosopher and politician (assassinated) (b. 280 BC)