The Chichibu Railway 300 series (秩父鉄道300系) was an electric multiple unit (EMU) train type for Chichibu-ji express services on the Chichibu Main Line operated by the private railway operator Chichibu Railway in Japan.

[1] Two 2-car trains were built in 1959 with transverse seating for use on express services.

New SaHa 350 intermediate cars with aluminium bodies were added in 1966.

[1] The trains were replaced by 3000 series express EMUs and withdrawn by October 1992.

[2] The trains were formed of two driving motor cars and an intermediate trailer car as follows.