Portugal at The 2004 Summer Olympics

Athletics

Sixteen male athletes were listed to compete in fourteen events, but eventually only fourteen did so in thirteen events. Sixteen female athletes were expected to participate in ten events, but only thirteen eventually competed in nine events.

Men's 100 metres

Francis Obikwelu
- Round 1 (heat 5) → 10.09 (1st, 5th overall)
- Round 2 (heat 1) → 9.93 NR (1st, 2nd overall)
- Semifinal 1 → 9.97 (2nd, 2nd overall)
- Final → 9.86 NR

Men's 200 metres

Francis Obikwelu
- Round 1 (heat 1) → 20.40 (2nd, 3rd overall)
- Round 2 (heat 4) → 20.33 (1st, 6th overall)
- Semifinal 2 → 20.36 (2nd, 4th overall)
- Final → 20.14 (5th)

Men's 800 metres

João Pires
- Round 1 (heat 3) → 1:46.7 (6th, 29th overall)

Women's 800 metres

Nédia Semedo
- Round 1 (heat 1) → 2:02.61 (5th, 19th overall)

Men's 1500 metres

Rui Silva
- Round 1 (heat 1) → 3:37.98 (2nd, 7th overall)
- Semifinal 2 → 3:40.99 (2nd, 11th overall)
- Final → 3:34.68
Manuel Damião
- Round 1 (heat 3) → 3:39.94 (8th, 19th overall)
- Semifinal 1 → 3:37.16 (8th, 8th overall)

Women's 1500 metres

Carla Sacramento
- Round 1 (heat 1) → 4:07.73 (8th, 24th overall)
- Semifinal 2 → 4:10.85 (10th, 22nd overall)

Women's 5000 metres

Inês Monteiro
- Round 1 (heat 2) → 16:03.75 (18th, 34th overall)

Men's 10,000 metres

Eduardo Henriques → did not compete

Women's 10,000 metres

Fernanda Ribeiro → did not finish

Men's Marathon

Alberto Chaíça
- Final → 2:14:17 (8th)
Luís Jesus → did not compete

Women's Marathon

Helena Sampaio → 2:49:18 (47th)
Ana Dias → 3:08:11 (62nd)
Adelia Elias → did not compete
Fatima Silva → did not compete

Men's 110m hurdles

Luís Sá
- Round 1 (heat 3) → 14.01 (8th, 45th overall)

Men's 400m hurdles

Edivaldo Monteiro
- Round 1 (heat 5) → 49.53 (4th, 25th overall)
- Semifinal 1 → 49.26 (7th, 18th overall)

Men's 3000 metre steeplechase

Manuel Silva
- Round 1 (heat 3) → 8:38.31 (11th, 33rd overall)

Women's pole vault

Elisabete Tavares → did not compete

Men's long jump

Gaspar Araújo
- Qualifying group B) → 7.49 (17th, 33rd overall)

Men's triple jump

Nelson Évora
- Qualifying group B → 15.72 (23rd, 40th overall)

Women's discus throw

Teresa Machado
- Qualifying group B → 58.47 (12th, 23rd overall)

Men's hammer throw

Vítor Costa
- Qualifying group A → 72.47 (12th, 27th overall)

Women's hammer throw

Vânia Silva
- Qualifying group A → 63.81 (18th, 34th overall)

Women's heptathlon

Naide Gomes → 6151 pts (13th)
- 100 metre hurdles (heat 3) → 13.58 PB (4th, 1039 pts)
- High jump (group A) → 1.85 SB (2nd, 1041 pts)
- Shot put (group B) → 14.71 PB (2nd, 841 pts)
- 200 metres (heat 5) → 25.46 SB (3rd, 845 pts)
- Long jump (group A) → 6.10 (8th, 880 pts)
- Javelin (group B) → 40.75 PB (13th, 682 pts)
- 800 metres (heat 3) → 2:20.05 PB (7th, 823 pts)