Nikolai Foliaki (born 25 December 1997) is a Tongan rugby union player, currently playing for the and . His preferred position is centre.
Foliaki plays his club rugby for Karaka RFC.
Foliaki was first named in the squad for the 2019 Mitre 10 Cup, and was again named in the 2022 squad. Having spent pre-season with the Western Force, he was named in their squad for Round 3 of the 2023 Super Rugby Pacific season against .
He made his debut for Tonga in 2021 against New Zealand.