The Keio 8000 series (京王8000系) is an electric multiple unit (EMU) train type operated by the private railway operator Keio Corporation on commuter services in the Tokyo area of Japan since 1992.

[3] Six-car and four-cars sets (and occasionally a pair of four-car sets) used to be operated on splitting services which separated and re-joined at Takahatafudō Station until 2006.

From 2013 to 2019, all six- and four-car 0-subseries sets underwent a refurbishment program.

Among several technical upgrades, the cabs of the two inner ends were removed to form 10-car sets.

[3] The 8000 series trains are used exclusively on Keio Corporation lines.