The Keikyu 2100 series (京急2100形) is a DC electric multiple unit (EMU) train type operated by the private railway operator Keikyu in the Tokyo area of Japan since 1998. It replaced the earlier 2000 series on limited-stop Limited Express (快特, Kaitoku) reserved seat services. A total of 10 8-car sets were built by Kawasaki Heavy Industries and Tokyu Car, and the first sets entered service on 28 March 1998.