The 2014–15 Campeonato Nacional de Seniores was the second season of the third-tier football league in Portugal.
[1][2] After a First Stage in a home-and-away system, the first two best placed teams of each league played in two groups of 8 teams in a Second Stage with each league winner earning a promotion to the LigaPro, plus a two-round play-off winner between the two second placed teams.
The two group winners then played a Grand Final on neutral ground for the overall Campeonato Nacional title.
The remaining 8 clubs from each league from the First Stage played in 8 different groups with the last two placed teams being relegated to the Districts Championships.
The 6th placed teams from those leagues then played a two-round play-off with between themselves to decide the remaining four clubs to be relegated.