Olga Viktorovna Zavyalova (), née "Korneyeva" (born August 24, 1972 in Leningrad) is a Russian cross-country skier who competed from 1993 to 2010. She won six medals at the FIS Nordic World Ski Championships with two gold (30 km: 2003, 7.5 km + 7.5 km double pursuit: 2007), one silver (10 km: 2007), and three bronzes (5 km + 5 km double pursuit, 15 km, and 4 × 5 km relay: all in 2003).