Kolbrún Ýr Kristjánsdóttir (born November 11, 1982, in Akranes) is a retired Icelandic swimmer, who specialized in backstroke and butterfly events.

Kolbrún made her first Icelandic team, as a 17-year-old teen, at the 2000 Summer Olympics in Sydney.

She posted a FINA B-standard entry time of 1:02.07 from the Games of the Small States of Europe in Valletta, Malta.

[4] She challenged seven other swimmers in heat two, including five-time Olympian Mette Jacobsen of Denmark.

She edged out Hong Kong's Sze Hang Yu to pick up a sixth seed by 0.09 of a second in 1:02.33.