Sara Björk Gunnarsdóttir (born 29 September 1990) is an Icelandic professional footballer who plays as a midfielder for Saudi Women's Premier League club Al Qadsiah.

After three subsequent seasons with Breiðablik, she left Iceland in 2011, to sign a three-year professional contract with Swedish club LdB FC Malmö.

[6] In May 2016, Sara Björk announced that she would not extend her contract with Malmö (now known as FC Rosengård) and planned to leave Sweden after winning four Damallsvenskan titles in five years.

[16] Still a month short of her 17th birthday, she made her national team debut in a UEFA Women's Euro 2009 qualifying match versus Slovenia in Dravograd.

Sara Björk scored twice in Iceland's 3–1 win over Norway at the 2009 Algarve Cup and was selected in the squad for the UEFA Women's Euro 2009 finals in Finland.

With Margrét Lára Viðarsdóttir on maternity leave, incoming national coach Freyr Alexandersson appointed Sara Björk as Iceland's new team captain in 2014.

[22] In January 2023, Sara Björk wrote an article in the Player's Tribune publicizing Lyon's neglect of maternal care for her while she was pregnant and postpartum, including failure to properly pay her.