The Men's 400 metre freestyle S9 event at the 2016 Paralympic Games took place on 9 September 2016, at the Olympic Aquatics Stadium. Two heats were held. The swimmers with the eight fastest times advanced to the final.

Heats Heat 1 10:42 9 September 2016:

Rank Lane Name Nationality Time Notes 1 4 4:22.20 2 3 4:22.63 3 5 4:22.86 4 6 4:22.89 5 2 4:28.94 6 7 4:35.68 7 1 4:44.71

Heat 2 10:49 9 September 2016: Rank Lane Name Nationality Time Notes 1 4 4:20.46 2 3 4:24.86 3 5 4:27.87 4 2 4:29.53 5 6 4:35.04 6 1 4:37.28 7 7 4:44.00

Final 19:41 9 September 2016:

Rank Lane Name Nationality Time Notes 4 4:12.73 5 4:17.91 3 4:21.38 4 2 4:23.04 5 7 4:24.02 6 1 4:26.28 7 8 4:27.22 8 6 4:27.73

Notes