600 series may refer to:
Japanese train types
Keihan 600 series, a train operated by Keihan Electric Railway since 1984 Keikyu 600 series, a train operated by Keikyu since 1994 Keikyu 600 series, a train operated by Keikyu from 1956, which later became the Keikyu 700 series (1956)
E1 Series Shinkansen, originally scheduled to be classified "600 series"
Computing and electronics 600 series connector, the Australian standard telephone handset connector before the introduction of the RJ11 and RJ12 modular connectors GE-600 series mainframe computers GeForce 600 series graphics processing units Radeon 600 series graphics processing units ThinkPad 600 series, a line of laptop computers
Other Bombardier Challenger 600 business jets Daimler-Benz DB 600 series aircraft engines French 600 Series submarines Italian 600 Series submarines Rover 600 Series car
See also Series 6 (disambiguation) 6000 series (disambiguation)