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The men's 400 metres event at the 1975 Pan American Games was held in Mexico City on 17 and 18 October.^[1]^[2]

Medalists

Gold	Silver	Bronze
Ronnie Ray United States	Alberto Juantorena Cuba	Delmo da Silva Brazil

Rank	Heat	Name	Nationality	Time	Notes
1	3	Alberto Juantorena	Cuba	47.19	Q
2	3	Alfred Daley	Jamaica	47.51	Q
3	1	Delmo da Silva	Brazil	47.81	Q
4	3	Mike Sands	Bahamas	47.81	Q
5	3	Juan Franceschi	Puerto Rico	47.82	Q
6	2	Miguel López	Mexico	47.87	Q
7	3	Hugo Tanino	Argentina	48.06	Q
8	2	Trevor Campbell	Jamaica	48.31	Q
9	3	Aubrey Wilson	Guyana	48.34	Q
10	2	Brian Saunders	Canada	48.64	Q
11	1	Félix Ríos	Puerto Rico	48.76	Q
12	1	Ronnie Ray	United States	49.09	Q
13	1	Glenn Bogue	Canada	49.10	Q
14	1	Eddy Gutiérrez	Cuba	49.62	Q
15	3	Wilfrid Cyriaque	Haiti	51.82
	2	Maurice Peoples	United States	DNS

Rank	Heat	Name	Nationality	Time	Notes
1	2	Alberto Juantorena	Cuba	45.46	Q
2	1	Ronnie Ray	United States	46.05	Q
3	1	Eddy Gutiérrez	Cuba	46.24	Q
4	1	Mike Sands	Bahamas	46.28	Q
5	1	Glenn Bogue	Canada	46.52	Q
6	2	Delmo da Silva	Brazil	46.55	Q
7	1	Alfred Daley	Jamaica	46.56
8	2	Trevor Campbell	Jamaica	46.93	Q
9	2	Brian Saunders	Canada	47.46	Q
10	2	Félix Ríos	Puerto Rico	47.80
11	2	Miguel López	Mexico	47.83
12	2	Aubrey Wilson	Guyana	48.45
13	1	Juan Franceschi	Puerto Rico	53.46
	1	Hugo Tanino	Argentina	DNS

Rank	Name	Nationality	Time	Notes
	Ronnie Ray	United States	44.45	GR
	Alberto Juantorena	Cuba	44.80
	Delmo da Silva	Brazil	45.53
4	Mike Sands	Bahamas	45.89
5	Eddy Gutiérrez	Cuba	46.15
6	Brian Saunders	Canada	46.30
7	Trevor Campbell	Jamaica	46.61
8	Glenn Bogue	Canada	47.29

^ "Track and Field Statistics". trackfield.brinkster.net. Retrieved 29 November 2019.
^ Full results
^ ^a ^b "Atletismo" (in Portuguese). Jornal do Brasil. 18 October 1975. p. 24. Retrieved 10 December 2019.
^ Year list
^ "Semifinals results". Tampa Bay Times. 18 October 1975. p. 34. Retrieved 10 December 2019.