2017–18 Campeonato de Portugal

The 2017–18 Campeonato de Portugal is the fifth season of Portuguese football's renovated third-tier league, since the merging of the Segunda Divisão and Terceira Divisão in 2013, and the third season under the current Campeonato de Portugal title. A total of 80 teams compete in this division, which began on 20 August 2017 and ended on 10 June 2018.

Format
The competition format consists of two stages. In the first stage, the 80 clubs will be divided in five series of 16 teams, according to geographic criteria. In each series, teams play against each other in a home-and-away double round-robin system.

In the second stage, the five best-placed teams from each first-stage series and the best three runners-up will dispute a series of playoff matches to promote to the LigaPro. The two finalists will be promoted directly. The six bottom clubs of each series will be relegated.

Teams
Relegated from the 2016–17 LigaPro:
 * Vizela
 * Fafe
 * Freamunde
 * Olhanense

From the 2016–17 Campeonato de Portugal:


 * AD Oliveirense
 * Bragança
 * Merelinense
 * Mirandela
 * Montalegre
 * Pedras Salgadas
 * Torcatense
 * Vilaverdense
 * Aliança de Gandra
 * Amarante
 * Camacha
 * Felgueiras 1932
 * Marítimo B
 * Pedras Rubras
 * São Martinho
 * Trofense
 * Cesarense
 * Cinfães
 * Coimbrões
 * Gondomar
 * Salgueiros
 * Sanjoanense
 * Sousense
 * AD Nogueirense
 * Anadia
 * Gafanha
 * Lusitano de Vildemoinhos
 * Mortágua
 * Recreio de Águeda
 * Benfica de Castelo Branco
 * Fátima
 * Oleiros
 * Operário
 * Sertanense
 * Sporting Ideal
 * União de Leiria
 * Alcanenense
 * Caldas
 * Lusitânia
 * Mafra
 * Praiense
 * Torreense
 * Vilafranquense
 * 1º de Dezembro
 * Casa Pia
 * Loures
 * Oriental
 * Sacavenense
 * Sintrense
 * Almancilense
 * Armacenenses
 * Farense
 * Louletano
 * Lusitano VRSA
 * Moura
 * Pinhalnovense

Promoted from the 2016–17 District Championships:


 * Algarve FA: Moncarapachense
 * Aveiro FA: Espinho
 * Beja FA: Castrense
 * Braga FA: Arões
 * Bragança FA: Argozelo
 * Castelo Branco FA: Águias do Moradal
 * Coimbra FA: Sourense
 * Évora FA: Estrela de Vendas Novas
 * Guarda FA: Fornos de Algodres
 * Leiria FA: Marinhense
 * Lisboa FA: Pêro Pinheiro
 * Madeira FA: Câmara de Lobos
 * Portalegre FA: Elétrico Ponte de Sôr
 * Porto FA: Canelas 2010
 * Santarém FA: Coruchense
 * Setúbal FA: Olímpico do Montijo
 * Viana do Castelo FA: Alt. Arcos Valdevez
 * Vila Real FA: Mondinense
 * Viseu FA: Ferreira de Aves
 * Liga Meo Azores: Sporting de Guadalupe

Knockout stage
The 5 winners and the best 3 runners-up were qualified to the knockout stage, where the winning team and the runner-up were promoted to Segunda Liga.