Graham Victor Mattson[3] is a New Zealand former rugby league footballer, and coach who represented New Zealand and later coached Tonga.
Between 1964 and 1965 Mattson played in three test matches for the New Zealand national rugby league team.
[4] Mattson began his coaching career in the 1970s with Point Chevalier before coaching the Mangere East Hawks, spending most of his time with the lower grades.
[4] In 1981 Mattson was the head coach of the new Papatoetoe Panthers club and was on their inaugural committee.
[8] Mattson later coached Tonga at the 1994 Pacific Cup.