Previously, Posušje won the southern group of the Second League of FBiH in the 2017–18 season, going 12 rounds undefeated to start the season.[2] However, the club did not gain promotion after losing to Goražde in the play-offs.[3]
Previous names of the club have included NK Zidar (from 1950) and NK Boksit (from 1963), with the current name being adopted in the early 1990s. Posušje's fans are now known as the Poskoci (Horned Vipers), but were previously known as Torcida. The stadium's name, "Mokri Dolac", means 'Wet Valley'.