Helgi Jónas Guðfinnsson (born 18 April 1976) is an Icelandic basketball coach and former professional player.
He spent the majority of his career with Grindavík where he won the Icelandic championship in 1996 and the Icelandic Cup in 1995, 1998 and 2006.
He was twice named the Úrvalsdeild Domestic Player of the Year and once the Icelandic Basketball Men's Player of the Year.
After his playing career came to an end, Helgi went into coaching and led Grindavík to the Icelandic Cup in 2011 and the national championship in 2012.