The men's 400 metres sprint competition of the athletics events at the 1979 Pan American Games took place at the Estadio Sixto Escobar.[1][2] The defending Pan American Games champion was Ronnie Ray of the United States.
Prior to this competition, the existing world and Pan American Games records were as follows:
All times shown are in seconds.
Held on 11 July
Held on 11 July[3]
Held on 12 July
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