Margrét Lára Viðarsdóttir (born 25 July 1986) is an Icelandic former footballer who played the striker position.
She is the all-time top goalscorer of Iceland's national team and competed at the UEFA Women's Championships in 2009 and 2013.
In a club career sometimes disrupted by injury Margrét Lára represented ÍBV and for Valur of the Icelandic Úrvalsdeild, Duisburg and Turbine Potsdam of the German Bundesliga and Linköpings and Kristianstads DFF of the Swedish Damallsvenskan.
Margrét Lára is the elder sister of Elísa Viðarsdóttir, who also played for Iceland's national team.