Þröstur Þórhallsson (born 19 March 1969), sometimes anglicized as Thröstur Thórhallsson, is an Icelandic chess grandmaster.

His peak rating is 2510, set in July 1997.

[1] He won the Icelandic Chess Championship in 2012.

9 ranked Icelandic player as of September 2020.

[2] This biographical article relating to an Icelandic chess figure is a stub.