Lydia Wideman (later "Wideman-Lehtonen"; 17 May 1920 – 13 April 2019) was a Finnish Olympic cross-country skier gold medalist. She was born in Vilppula, Finland. She was the first female Olympic medalist in cross-country skiing. In 1952 she competed in thirteen 10 km races and won all of them, including the 1952 Winter Olympics, national championships and Lahti Ski Games.