Results for Portugal in 400 metres, Men

Olympic and Intercalated results only.

Games	Athlete/Team	Placement
1912 Summer Olympics	Armando Cortesão	3 h3 r1/3
	Alexandre Correia Leal	DNS
1928 Summer Olympics	António Dias	DNS
1952 Summer Olympics	Fernando Casimiro	7 h6 r1/4
1972 Summer Olympics	Fernando Silva	6 h5 r1/4
1976 Summer Olympics	José Carvalho	7 h6 r1/4
1988 Summer Olympics	Filipe Lombá	5 h2 r1/4
2020 Summer Olympics	Ricardo dos Santos	7 h1 r1/3
2024 Summer Olympics	João Coelho	5h4 r2/4