Guðrún Gróa Þorsteinsdóttir (born 21 January 1989) is an Icelandic basketball player and a former power lifter.
Guðrún started her senior career with KR in 2006 and was a key player in the team's 2010 championship run.
[9] For the season she averaged 10.4 points, 7.3 rebounds and 2.6 assists, and was named to the Úrvalsdeild Domestic All-First Team.
She was named 1. deild's I Player of the Year and to the leagues Domestic All-First Team in 2016 after averaging 15.4 points and 13.3 rebounds for the season.
[14] Guðrún is the sister of track and field athlete Helga Margrét Þorsteinsdóttir.