Nefyn United FC had been a regular fixture in the Welsh Alliance League, finishing around the mid-table for nine seasons after gaining promotion from the Gwynedd League in 2005. However, disaster struck before the 2014–15 season when manager Geraint Evans resigned from his post to become station officer at the local fire station, leaving the club without a manager for the upcoming season. Unable to find a suitable replacement in time, the club ultimately decided to move back to the Gwynedd League, two tiers below where they had been competing due to the introduction of the Welsh Alliance League Division 2 in 2010.
The club finished the 2014–15 season in the Gwynedd League in 6th place.
In 2017-18 Nefyn reached three finals, losing in extra time to Gwalchmai 2–1 in the Safeflue Cup and losing to Bro Goronwy in the Bob Owen Memorial Cup. In the Junior cup, they beat Bontnewydd after extra time 4–2.
- Gwynedd Football League, North Wales Coast West League Premier Division
- 2019, 2021
- Cae'r Delyn