The Men's 400 metres T13 event at the 2012 Summer Paralympics took place at the London Olympic Stadium from 31 August to 2 September.

[1] The T13 category is for athletes with a moderate visual impairment.

Athletes in this category have a variety of visual impairments, but can typically recognize contours from a distance of 2 to 6 metres.

Prior to the competition, the existing World and Paralympic records were as follows: Competed 31 August 2012 from 10:55.

rule: first 3 in each heat (Q) plus the 2 fastest other times (q) qualified.