Guðni Valur Guðnason (born 11 October 1995) is an Icelandic discus thrower who was selected to compete at the 2016 Summer Olympics in Rio de Janeiro. He failed to qualify to the finals.
His personal best in the event is 63.50 metres set in Hafnarfjördur in 2015.
|2015||Games of the Small States of Europe||Reykjavík, Iceland||1st||56.40 m|
|European U23 Championships||Tallinn, Estonia||15th (q)||53.66 m|
|2016||European Championships||Amsterdam, Netherlands||22nd (q)||61.20 m|
|Olympic Games||Rio de Janeiro, Brazil||21st (q)||60.45 m|