Yana Valeryevna Martynova (; born 3 February 1988, in Kazan) is a Russian swimmer who competes in the Women's 400m individual medley. At the 2004 Summer Olympics she competed in the women's 400 m individual medley, finishing in 21st place. At the 2008 Olympics, she competed in the 400 m individual medley and the 200 m butterfly. She reached the final of the 400 m individual medley. At the 2012 Summer Olympics she finished 24th overall in the heats in the Women's 400 metre individual medley and failed to reach the final.