Stefán Kristjánsson (8 December 1982 – 28 February 2018) was an Icelandic chess grandmaster and professional poker player.

His attacking playstyle, strong personality and common refusal to accept draws in equal endgames led to elder members of the Reykjavík chess community giving him the affectionate nickname "Pönkið" ("Punk").

[2] Stefán continued to improve: he won the Icelandic School Chess Championship in 2000,[3] and earned his international master title in 2002, at the age of 19. International master and journalist Björn Thorfinnsson described him as the strongest of his age group.

[4] Stefán earned his first grandmaster (GM) norm at the Drammen International, held at the start of 2005, scoring 7/9.

[5] Stefán began to compete less regularly after this point as he focused on other pursuits, but he dedicated himself to improving his rating in order to attain the GM title.

[17][18] Björn Thorfinnsson stated that Stefán's ability to calculate variations in chess translated well to poker, and helped him become a successful player.

[2] He earned enough through the game to buy an apartment without debt as well as a Lexus, and gained fame in the Icelandic poker community.