[1] This competition consists of a first stage with all the teams then proceed to a promotion or relegation series depending on their performance.

The winners of each series will be automatically promoted to Liga Portugal 2 and will face each other in a neutral venue to determine the champion.

The two bottom teams of each series will be relegated to Campeonato de Portugal for this season.

Cova da Piedade failed to produce valid licensing documentation to compete in the 2022–23 season of the Liga 3, so they had been relegated by the Portuguese Football Federation to District Championships.

[3] As a result, an additional team of (2021–22 Campeonato de Portugal) will be promoted to Liga 3 for the 2022–23 season.