Date of Birth: 
About Sumiko Yokoyama
- Sumiko Yokoyama (?? ???, 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. 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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