Ida Nilsson (born February 8, 1981) is a Swedish long-distance runner who also competes in ski mountaineering. In 2003 – 2006 she won a total of ten gold medals in Swedish championships in track & field and cross country running, plus two NCAA gold medals. After many years away from training Nilsson won the Swedish championship in ski mountaineering in 2016 and a couple of months later won the prestigious Transvulcania ultramarathon.