Þráinn Hjálmarsson (Thrainn Hjalmarsson, born 1987) is an Icelandic composer.
Þráinn earned a bachelor's degree from the Iceland Academy of the Arts in 2009 and a master's degree in composition from the Royal Conservatory of The Hague in 2011. He is a member of the Icelandic composers' collective S.L.Á.T.U.R (Society of artistically obtrusive composers around Reykjavík).
The BBC Scottish Symphony Orchestra under Ilan Volkov performed his As Heard Across a Room as part of a concert of new Icelandic works in 2014; critics described it as "finespun" and "paradox music: like trying to make out the structure of a void". His Lucid/Opaque (for string trio) was premiered by Nordic Affect at the annual Dark Music Days festival in 2016; a critic described it as "contain[ing] beautiful meditative stillness". Influence of buildings on musical tone for a chamber ensemble represented Iceland at the International Rostrum of Composers in Helsinki in 2014.
- "Þráinn Hjálmarsson" (in Icelandic). Iceland Academy of the Arts. Retrieved 2017-08-22.
- "S.L.Á.T.U.R." Retrieved 2017-08-22.
- Molleson, Kate (October 6, 2012). "BBCSSO/Volkov review – new Icelandic work chills and thrills". The Guardian. Retrieved August 22, 2017.
- Cummings, Simon (2017-06-17). "Þráinn Hjálmarsson – As heard across a room (World Première)". 5:4. Retrieved 2017-08-22.
- Gamboa, Gavin (2016-03-03). "Dark Music Days 2016 Recap: Day Three". I Care If You Listen. Retrieved 2017-08-22.
- "IRC 2015". 2014-06-30. Retrieved 2017-08-22.