Ragnar Ágúst Nathanaelsson is an Icelandic basketball player who plays for Hamar. He participated at EuroBasket 2015 as a member of the Icelandic national team. He is a two time Úrvalsdeild Domestic All-First team selection and won the Icelandic Basketball Cup in 2022.

The Iceland men's national basketball team represents Iceland in international basketball tournaments. The team is controlled by the Icelandic Basketball Association.