Nikorima spent the early rounds of the season playing in the QLD Cup for the Norths Devils before making his first appearance for the Broncos in Round 6 against the Sydney Roosters, playing off the interchange bench in the 32-8 win at Suncorp Stadium. When Broncos first choice halfback Ben Hunt was sidelined with a hamstring injury for 5 matches, Nikorima was selected to fill in at halfback and it come with great success resulting with the Broncos winning 5 matches in a row and him scoring 4 tries in that period of time. On 5 May 2017, Nikorima played for New Zealand in the 2017 ANZAC Test against Australia where he played off the interchange bench in the 30-12 loss at Canberra Stadium. On 17 July 2017, Nikorima extended his contract with the Broncos to the end of the 2020 season. Nikorima finished the 2017 NRL season with him playing in 19 matches and scoring 7 tries for the Broncos. On 5 October 2017, Nikorima was named in the 24-man New Zealand Kiwis squad for the 2017 Rugby League World Cup. In the Kiwis first pool match against Samoa, Nikorima scored his first international try for the Kiwis in the 38-8 win at Mt Smart Stadium. Nikorima finished the Kiwis disappointing campaign with him playing in 3 matches and scoring 1 try.