Jón Halldór Eðvaldsson (born 13 March 1975) is an Icelandic basketball coach and television personality.

[1] Before turning to coaching, Jón Halldór was a basketball referee[2] and a football player for several years, playing the goalkeeper position.

[4] In June 2006, Jón Halldór was hired as the head coach of Úrvalsdeild kvenna club Keflavík.

[13] In February 2014, with Grindavík in second-to-last place in the Úrvalsdeild kvenna, Jón Halldór stepped down as head coach.

[15] Keflavík opened the 2019–20 season with a 105-81 loss against reigning champions Valur in the annual Icelandic Super Cup.