Yukio Motoki (元木由記雄, Motoki Yukio) (born Higashiōsaka, Osaka. August 27, 1971) is a former Japaneserugby union footballer. He played as a centre and was known for his powerful running and tackling.
Motoki had 79 caps representing Japan, scoring 9 tries, 45 points in aggregate, from 1991 to 2005. He was selected for four Rugby World Cup finals: in 1991, without playing; in 1995, playing in three matches; in 1999, again in three matches; and in 2003. He never scored in any of his World Cup presences.