2021 Papua New Guinea National Soccer League

After initially deciding the league format would be the same as the previous season – one national league consisting of ten teams^[3][4] – the Papua New Guinea Football Association and NSL board eventually reverted to a format that they had previously used in the 2015–16 season, splitting the league into two regional divisions, a Northern Conference and a Southern Conference, each with seven teams.^[5][6]

Seven clubs returned from the previous season: six-time reigning champions Lae City, eight-time champions Hekari United, fourth-placed side Komara Gulf, Morobe United, Morobe Wawens, Star Mountain and Tusbab Stallions. Grand Final runners-up Vitiaz United withdrew, citing financial difficulties.^[7] Kutubu and Bougainville also withdrew from the league. A phoenix side, Lae City Dwellers, led by sacked Lae City FC coach Peter Gunemba, announced their return to the league in May 2021,^[8] although there was an element of confusion as to which of the two sides had the right to claim the franchise's previous titles.^[9] There were returns to the league for Tavur FC (also known as WNB Tavur), Sepik FC, and Port Moresby Strikers (also known as Southern Strikers), while Central Dabari FC was a late acceptance into the league.^[10] There was also room for two development sides in each of the conferences.