2017–18 NIFL Premier Intermediate League

The 2017–18 NIFL Premier Intermediate League was the second season of the NIFL Premier Intermediate League, the third tier of the Northern Ireland Football League - the national football league in Northern Ireland. It ran from 12 August 2017 to 4 May 2018 and Dundela were crowned as champions, winning promotion to the 2018–19 NIFL Championship.

Teams
Twelve teams competed in the league. Armagh City and Annagh United from were relegated the 2016–17 NIFL Championship and Portstewart were promoted as the winners of the 2016–17 Northern Ireland Intermediate League.

Matches 1–22
During matches 1–22 each team plays every other team twice (home and away).

Matches 23–27
During matches 23–27 each team will play every other team in their half of the table once.

NIFL Championship play-off
The eleventh-placed team from the Championship, Dergview, played the runners-up from the 2017–18 Premier Intermediate League, Queen's University, over two legs for one spot in the NIFL Championship.

Dergiew won 4-1 on aggregate and retained their position in the NIFL Championship with Queen's University remaining in the NIFL Premier Intermediate League.