Dagur Kár Jónsson (born 15 February 1995) is an Icelandic basketball player who last played for Club Ourense Baloncesto of the LEB Plata. A 185 cm point guard, he won the Icelandic Basketball Cup in 2013 and 2015 as a member of Stjarnan. In 2019, he debuted for the Icelandic national team.