Series 4

Series 4 could refer to:


 * Aston Martin Lagonda Series 4, the automobile model
 * BMW 4 Series, the automobile model line
 * GeForce 4 series, line of nVidia video cards
 * Scania 4-series, the truck model line
 * South African Class 6E1, Series 4, electric locomotive series
 * Series 4, the registered options principal exam