| Competition: | Primeira Divisão |
| Season: | 1989–90 |
| Winners: | Porto 11th title |
| Relegated: | Portimonense Feirense |
| Continentalcup1: | European Cup |
| Continentalcup1 Qualifiers: | Porto (first round) |
| Continentalcup2: | Cup Winners' Cup |
| Continentalcup2 Qualifiers: | Estrela da Amadora (first round) |
| Continentalcup3: | UEFA Cup |
| Continentalcup3 Qualifiers: | Benfica (first round) Sporting CP (first round) Vitória de Guimarães (first round) |
| League Topscorer: | Magnusson (33 goals) |
| Biggest Home Win: | Benfica 7–0 Penafiel (14 October 1989) Porto 7–0 Tirsense (26 November 1989) |
| Biggest Away Win: | Braga 0–4 Benfica (3 December 1989) |
| Highest Scoring: | Benfica 7–0 Penafiel (14 October 1989) Porto 7–0 Tirsense (26 November 1989) |
| Matches: | 306 |
| Total Goals: | 666 |
| Prevseason: | 1988–89 |
| Nextseason: | 1990–91 |
The 1989–90 Primeira Divisão was the 56th edition of top flight of Portuguese football. It started on 20 August 1989 with a match between Chaves and Penafiel, and ended on 20 May 1990. The league was contested by 18 clubs with Benfica as the defending champions.
Porto qualified for the 1990–91 European Cup first round, Estrela da Amadora qualified for the 1990–91 European Cup Winners' Cup first round, and Benfica, Sporting CP and Vitória de Guimarães qualified for the 1990–91 UEFA Cup first round; in opposite, Portimonense and Feirense were relegated to the Liga de Honra. Magnusson was the top scorer with 33 goals.
Espinho, Fafe, Farense, Leixões and Académico de Viseu were consigned to the Liga de Honra following their final classification in 1988–89 season.
The other five teams were replaced by União da Madeira, Feirense and Tirsense from the Liga de Honra, as the league dropped from 20 to 18 teams.
| Team | Outgoing manager | Date of vacancy | Position in table | Incoming manager | Date of appointment | |
|---|---|---|---|---|---|---|
| Penafiel |  Carlos Alhinho | 22 October 1989 | 18th | José Augusto | 23 October 1989 | |
| Belenenses | 29 October 1989 | 11th |  Moisés Andrade | 5 November 1989 | ||
| Boavista | Raul Águas | 5 November 1989 | 10th | Manuel Barbosa | 6 November 1989 | |
| Marítimo | 5 November 1989 | 13th | Ferreira da Costa | 3 December 1989 | ||
| Portimonense | José Torres | 19 November 1989 | 17th | Quinito | 20 November 1989 | |
| Nacional | 26 November 1989 | 18th | Jair Picerni | 4 December 1989 | ||
| Sporting | Manuel José | 10 December 1989 | 4th | Vítor Damas | 11 December 1989 | |
| Sporting | Vítor Damas | 23 December 1989 | 4th | Raul Águas | 24 December 1989 | |
| Beira-Mar | 28 January 1990 | 12th | Vítor Urbano | 29 January 1990 | ||
| Portimonense | Quinito | 4 March 1990 | 18th | Manuel de Oliveira | 5 March 1990 | |
| Penafiel | José Augusto | 14 April 1990 | 16th | Joaquim Teixeira | 15 April 1990 | |
| Vitória de Setúbal | Manuel Fernandes | 21 April 1990 | 5th | Conhé | 25 April 1990 |
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Magnusson | Benfica | 33 |
| 2 | Rui Águas | Porto | 18 |
| 3 | Getov | Portimonense | 15 |
| 4 | Madjer | Porto | 13 |
| 5 |  Ricky | Estrela da Amadora | 12 |
| Isaías | Boavista | ||
| 7 | Mladenov | Vitória de Setúbal | 11 |
| Jorge Andrade | Boavista | ||
 Chiquinho Conde | Belenenses | ||
 Demol | Porto |