Kosei Inoue (?? ??, Inoue Kosei, born May 15, 1978 in Miyakonojo, Miyazaki) is a Judo practitioner from Japan.
He won the gold medal in the under 100 kg class at the 2000 Summer Olympics.
He is well known for his specialty throws, Uchi Mata (??, inner thigh throw) and Ouchi gari (???, major inner reap).
He is considered by the Judo community as one of the best competitive Judokas.
His notable accomplishments include three golds at the World Championship and All Japan Championship (one of four Judokas who has accomplished this).
His older brother, Tomokazu Inoue is also judoka and former Asian champion.
He is affiliated with Sohgo Security Services (Alsok), a security firm.