308 or .308 may refer to:

308, year 308 AD 308 BC 308 (number) .308 caliber, firearms cartridges with bullet diameters of 0.308 inches (7.62 mm) .308 Winchester, a popular rifle cartridge British Rail Class 308, an electric multiple unit train Peugeot 308, a small family car 308 Polyxo, a main-belt asteroid Ross 308, a breed of fast-growing chicken Several cars produced by Ferrari: Ferrari 308 GT4, a sports car Ferrari 308 GTB/GTS, a sports car USS William Jones (DD-308) warship The 308 cubic inch Holden V8 engine