Samúel represented the Icelandic U-17 national team on 11 occasions between 2011 and 2012, scoring twice, with his debut coming on 2 August 2011, in a 3–1 win over Sweden U-17.[11] Samúel went on to represent the U-19 team twenty times between 2013 and 2014, scoring three times, with his debut coming in a 1–1 home draw against Denmark.[11] On 26 March 2015, Samúel made his debut for the U-21 team in their 3–0 defeat to Romania.[11] Samúel made his debut for Iceland on 11 January 2018 in an unofficial friendly against Indonesia Selection.[12]