1990–91 Primeira Divisão
The 1990–91 Primeira Divisão was the 57th edition of top flight of Portuguese football. It started on 19 August 1990 with a match between Farense and Nacional, and ended on 26 May 1991. The league was contested by 20 clubs with Porto as the defending champions.
Benfica qualified for the 1991–92 European Cup first round, Porto qualified for the 1991–92 European Cup Winners' Cup first round, and Sporting CP, Boavista and Salgueiros qualified for the 1991–92 UEFA Cup first round; in opposite, Tirsense, Vitória de Setúbal, Estrela da Amadora, Belenenses and Nacional were relegated to the Liga de Honra. Rui Águas was the top scorer with 25 goals.
Promotion and relegation
Teams relegated to [Liga de Honra]
- Portimonense
- Feirense
Teams promoted from Liga de Honra
- Salgueiros
- Gil Vicente
- Farense
- Famalicão
Teams
Stadia and locations
| Team | Head Coach | City | Stadium | 1989–90 finish |
| Beira-Mar |  Vítor Urbano | Aveiro | Estádio Mário Duarte | 11th |
| Belenenses |  Henri Depireux | Lisbon | Estádio do Restelo | 6th |
| Benfica |  Sven-Göran Eriksson | Lisbon | Estádio da Luz | 2nd |
| Boavista | João Alves | Porto | Estádio do Bessa | 8th |
| Braga | Raul Águas | Braga | Estádio Primeiro de Maio | 12th |
| Chaves | Manuel Barbosa | Chaves | Estádio Municipal de Chaves | 5th |
| Estrela da Amadora | Manuel Fernandes | Amadora | Estádio José Gomes | 13th |
| Famalicão |  Abel Braga | Vila Nova de Famalicão | Estádio Municipal 22 de Junho | 4th in Segunda Divisão |
| Farense |  Paco Fortes | Faro | Estádio de São Luís | 3rd in Segunda Divisão |
| Gil Vicente | Rodolfo Reis | Barcelos | Estádio Adelino Ribeiro Novo | 2nd in Segunda Divisão |
| Marítimo | Ferreira da Costa | Funchal | Estádio dos Barreiros | 10th |
| Nacional | Jair Picerni | Funchal | Estádio dos Barreiros | 14th |
| Penafiel | Joaquim Teixeira | Penafiel | Estádio Municipal 25 de Abril | 15th |
| Porto | Artur Jorge | Porto | Estádio das Antas | 1st |
| Salgueiros |  Zoran Filipovic | Porto | Estádio Engenheiro Vidal Pinheiro | 1st in Segunda Divisão |
| Sporting CP | Marinho Peres | Lisbon | Estádio José Alvalade | 3rd |
| Tirsense | Prof. Neca | Santo Tirso | Estádio Abel Alves de Figueiredo | 9th |
| União da Madeira | Rui Mâncio | Funchal | Estádio dos Barreiros | 16th |
| Vitória de Guimarães | Paulo Autuori | Guimarães | Estádio D. Afonso Henriques | 4th |
| Vitória de Setúbal |  José Romão | Setúbal | Estádio do Bonfim | 7th |