Sumiko Yokoyama (横山 寿美子, Yokoyama Sumiko, born March 25, 1974) is a Japanese cross country skier who competed from 1993 to 2008. Her best World Cup finish was fifth in a 4 x 5 km relay in Switzerland in 2003.

Sumiko Yokoyama
Medal record
Women's cross-country skiing
Representing  Japan
Asian Winter Games
Gold medal – first place 1996 Harbin 10 km freestyle
Gold medal – first place 1999 Gangwon 5 km classical
Silver medal – second place 1996 Harbin 5 km classical
Silver medal – second place 1999 Gangwon 10 km freestyle
Silver medal – second place 1999 Gangwon 4 × 5 km relay
Junior World Championships
Silver medal – second place 1994 Breitenwang 4 × 5 km relay

Yokoyama also competed in four Winter Olympics, earning her best finish of tenth in the 4 x 5 km relay at Salt Lake City in 2002. Her best finish at the FIS Nordic World Ski Championships was 8th in the 4 x 5 km relay at Sapporo in 2007.

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