The men's 50m freestyle S13 event at the 2012 Summer Paralympics took place at the London Aquatics Centre on 1 September.

There were two heats; the swimmers with the eight fastest times advanced to the final.

AF = African Record.

OC = Oceania Record.

Official London 2012 Paralympics Results: Heats Archived 2012-09-16 at the Wayback Machine Official London 2012 Paralympics Results: Final Archived 2012-09-16 at the Wayback Machine