Vignir Vatnar Stefansson is an Icelandic chess grandmaster.
In May 2023, he tied for the first place with Guðmundur Kjartansson andàHannes Stefánsson in the Icelandic Chess Championship. The trio played against each other in blitz tiebreaks, and Vignir ultimately defeated Guðmundur to become the national champion.
In July 2023, he finished in second place in the ÃÂeské BudÃÂjovice Chess Festival Rating Open A 2023, losing to Ameya Audi.