Ida Nilsson (born 8 February 1981) is a Swedish long-distance runner who also competes in ski mountaineering.

[8] She grew up in a sports family where both her father Carl-Gustaf "Calle" and mother Katarina competed at an elite level.

At the 2002 Swedish cross country championships the family walked home with four gold medals, one silver and one bronze.

[13] She finished seventh in the 3000m steeplechase at the 2006 European Athletics Championships in Gothenburg, where she set the Swedish national record at 9:39.24, a personal best.

[14] After leaving college in Arizona Nilsson had a series of injuries, including a stress fracture in her hip joint in 2009.

[20][21] Nilsson, who during her track & field career seldom ran as far as 10 km (6.2 mi), now competed in a number of longer races.

During the winter 2015 – 2016 Nilsson lived in Chamonix, France, and trained ski mountaineering with Emelie Forsberg.

[29] In 2018 Nilsson together with fellow athletes Emelie Forsberg and Mimmi Kotka started Moonvalley, an on-line shop dedicated to organic energy bars and sportsdrinks.