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Seiji Inagaki (born 28 April 1973) is a retired Japanese athlete who specialized in the 400 metres hurdles.

He won bronze medals in 4 × 400 metres relay in two editions of the World Indoor Championships; in 1993 with teammates Masayoshi Kan, Yoshihiko Saito and Hiroyuki Hayashi and in 1995 with Kan, Hayashi and Tomonari Ono [fr]. He also competed in the same event at the 1997 World Championships without reaching the final.[1]