| Competition: | Primeira Divisão |
| Season: | 1997–98 |
| Winners: | Porto 17th title |
| Relegated: | Leça Varzim Belenenses |
| Continentalcup1: | Champions League |
| Continentalcup1 Qualifiers: | Porto (group stage) Benfica (second qualifying round) |
| Continentalcup2: | Cup Winners' Cup |
| Continentalcup2 Qualifiers: | Braga (first round) |
| Continentalcup3: | UEFA Cup |
| Continentalcup3 Qualifiers: | V. Guimarães (first round) Sporting CP (first round) Marítimo (first round) |
| Continentalcup4: | Intertoto Cup |
| Continentalcup4 Qualifiers: | Estrela da Amadora (third round) |
| League Topscorer: | Mário Jardel (26 goals) |
| Biggest Home Win: | Benfica 7–1 Leça (17 May 1998) |
| Biggest Away Win: | 0–4 (3 times) |
| Highest Scoring: | Porto 7–2 Salgueiros (10 May 1998) |
| Matches: | 306 |
| Total Goals: | 770 |
| Prevseason: | 1996–97 |
| Nextseason: | 1998–99 |
The 1997–98 Primeira Divisão was the 64th edition of top flight of Portuguese football. It started on 25 August 1997 with a match between Varzim and Porto, and ended on 17 May 1998. The league was contested by 18 clubs with Porto as the defending champions.
Porto won the league and qualified for the 1998–99 UEFA Champions League group stage, along with Benfica, who qualified for the second round. Braga qualified for the 1998–99 UEFA Cup Winners' Cup first round, and V. Guimarães, Sporting CP and Marítimo qualified for the 1998–99 UEFA Cup; in opposite, Leça, Varzim and Belenenses were relegated to the Liga de Honra. Mário Jardel was the top scorer with 26 goals.
Espinho, União de Leiria and Gil Vicente, were consigned to the Liga de Honra following their final classification in 1996–97 season.
The other three teams were replaced by Campomaiorense, Varzim and Académica from the Liga de Honra.
| Team | Outgoing manager | Date of vacancy | Position in table | Incoming manager | Date of appointment | |
|---|---|---|---|---|---|---|
| Benfica | Manuel José | 20 September 1997 | 11th |  Mário Wilson | 21 September 1997 | |
| Leça | Rodolfo Reis | 28 September 1997 | 16th | Vítor Manuel | 29 September 1997 | |
| Belenenses | 5 October 1997 | 17th | Manuel Cajuda | 6 October 1997 | ||
| Campomaiorense | 19 October 1997 | 17th | João Alves | 20 October 1997 | ||
| Benfica | Mário Wilson | 1 November 1997 | 5th | Graeme Souness | 2 November 1997 | |
| Sporting | Octávio Machado | 1 November 1997 | 4th | Francisco Vital | 2 November 1997 | |
| Vitória de Guimarães | Jaime Pacheco | 2 November 1997 | 3rd | Quinito | 3 November 1997 | |
| Chaves | 9 November 1997 | 18th | Manuel Correia | 10 November 1997 | ||
| Vitória de Setúbal | 9 November 1997 | 14th |  Barrios | 10 November 1997 | ||
| Sporting | Francisco Vital | 6 December 1997 | 5th |  Vicente Cantatore | 7 December 1997 | |
| Boavista | Mário Reis | 12 December 1997 | 15th | Jaime Pacheco | 13 December 1997 | |
| Salgueiros | Carlos Manuel | 20 December 1997 | 6th | Dito | 21 December 1997 | |
| Sporting | Vicente Cantatore | 21 December 1997 | 5th | Carlos Manuel | 22 December 1997 | |
| Académica Coimbra | Henrique Calisto | 31 January 1997 | 15th | José Romão | 15 February 1998 | |
| Chaves | Manuel Correia | 11 January 1998 | 17th | Álvaro Magalhães | 12 January 1998 | |
| Braga | Castro Santos | 19 January 1998 | 10th | Alberto Pazos | 20 January 1998 | |
| Varzim | Horácio Gonçalves | 22 March 1998 | 16th | António Miranda | 23 March 1998 | |
| Vitória de Setúbal | Barrios | 5 April 1998 | 13th | Carlos Cardoso | 6 April 1998 |
| Rank | Player | Club | Goals |
|---|---|---|---|
| 1 |  Mário Jardel | Porto | 26 |
| 2 | Nuno Gomes | Benfica | 18 |
| 3 |  Ayew | Boavista | 16 |
| 4 | Isaías | Campomaiorense | 14 |
| Karoglan | Braga | ||
| 6 | Nandinho | Salgueirs | 13 |
| 7 | Gilmar | Vitória de Guimarães | 12 |
| Constantino Jardim | Leça | ||
 Artur Jorge Vicente | Braga | ||
| 10 |  Vali Gasimov | Vitória de Setúbal | 11 |
 Alex Bunbury | Marítimo | ||