Kristrún Rut Hassing Antonsdóttir (born 12 October 1994) is an Icelandic multi-sport athlete.

Kristrún was born in Odense, Denmark to Anton Tómasson and Helga Hassing.

[5] She returned to Selfoss in May 2018[6] before signing with Serie A club A.S. Roma in July the same year.

[10] Kristrún played five seasons with Hamar from 2009 to 2015 and helped the team to the 2010 Úrvalsdeild finals.

She spent the 2012–2013 season playing for Potomac High School in Dumfries, Virginia.