Athletics at the 2023 Parapan American Games – Men's 400 metres T20

The men's T20 400 metres competition of the athletics events at the 2023 Parapan American Games was held on November 23 - 24 at the Mario Recordón Athletics Training Center within the Julio Martínez National Stadium of Santiago, Chile.

Records
Prior to this competition, the existing world and Pan American Games records were as follows:

Results
All times shown are in seconds.

Semifinals
The fastest two athletes of each semifinal advance to the final. The results were as follows:

Final
The results were as follows: