Portugal competed at the 1964 Summer Olympics in Tokyo, Japan. 20 competitors, 19 men and 1 woman, took part in 20 events in 7 sports.^[1]

Men's 100m:

• José Fernandes da Rocha — 1st round: 4th (heat G)

Men's 200m:

• José Fernandes da Rocha — 1st round: 5th (heat H)

Men's 1500m:

• Manuel F. Oliveira — 1st round: DNS (heat C)

Men's 3000m Steeplechase:

• Manuel F. Oliveira — 4th (8.36,2)

Men's 5000m:

• Manuel F. Oliveira — 1st round: DNS (heat D)

Men's Marathon:

• A. R. Aldegalega — 44th (2:38.02,2)

Men's Individual Jumping:

• Henrique Alves Calado — 34th (−58,25 points)
• Joaquim Duarte Silva — 5th (−20,00 points)

Women's Individual All-Round Competition:

• Esbela Fonseca — 68th (69,763 points)
  1. Vault — 18,133
  2. Asymmetrical Bars — 16,699
  3. Balance Beam — 17,499
  4. Floor — 17,432

Men's Middleweight (68 – 80 kg):

• Fernando Costa Matos — 1st round: 2nd (group 8)

Finn:

• Hélder de Oliveira — 19th (2591 points)

Star:

• Duarte de Almeida Bello and Fernando Pinto Coelho Bello — 8th (3330 points)

Dragon:

• Joaquim Pinto Basto, Eduardo Guedes de Queiroz and Carlos Ferreira — 16th (1804 points)

Four shooters represented Portugal in 1964.

25 m pistol

• José Manuel Carpinteiro — 45th (552 marks)

50 m pistol

• Manuel da Costa — 58th (580 marks)

Trap

• Armando Marques — 18th (188 marks)
• Guy de Valle Flor — 28th (186 marks)

Men's 100m Freestyle:

• Herlander Ribeiro — 1st round: 6th (heat 3)

Men's 200m Butterfly:

• Vitor Manuel Fonseca — 1st round: 5th (heat 1)

Men's 400m Medley:

• António Basto — 1st round: 7th (heat 2)

• Correia Leal (chief of mission)