The Men's 400 metres T12 at the 2024 Summer Paralympics took place on 4-5 September 2024 at the Stade de France in Paris.

[1] The T12 classification is for visually impaired athletes with a LogMAR range from 1.50-2.60, and/or a maximum visual acuity range of 10 degrees.

Athletes may choose to run with a guide.

[2][3] The Heats took place on 4 September 2024, starting at 12:44 (UTC+2) in the morning session.

First in each heat (Q) and the next fastest (q) advance to the final.