Kazuma Ōseto (大瀬戸一馬, Ōseto Kazuma, born 5 August 1994) is a Japanese sprinter.
He won a silver medal in the 100 m at the 2011 World Youth Championships in Athletics, behind Odail Todd.
100 metresFormer Japanese junior and Japanese high school record holder - 10.23 s (wind: +1.3 m/s) (Hiroshima, 29 April 2012)4×100 m relayCurrent Asian and Japanese junior record holder - 39.01 s (relay leg:1st) (Barcelona, 13 July 2012)Current Japanese university record holder - 38.44 s (relay leg:4th) (Tianjin, 9 October 2013)Current Japanese high school record holder - 39.16 s (relay leg: 1st) (Fukuroi, 3 May 2012)Medley relay (100m×200m×300m×400m)Former Japanese youth best holder - 1:50.69 s (relay leg: 1st) (Lille, 10 July 2011)60 metres (Indoor)Former Japanese junior record holder - 6.71 s (Osaka, 2 February 2013)a with
Akiyuki Hashimoto,
Asuka Cambridge, and Kazuki Kanamori
b with Ryōta Yamagata,
Shōta Iizuka, and Asuka Cambridge
c with Akiyuki Hashimoto, Tatsurō Suwa, and Kazuki Kanamori
d with Akiyuki Hashimoto, Shōtarō Aikyō, and Takuya Fukunaga