The men's 100 metre backstroke was a swimming event held as part of the swimming at the 1912 Summer Olympics programme.

The Olympic record fell during the very first heat.

He was unable to match that pace in the final, but still took the win with a finish that was over 1 second faster than the second-place swimmer.

The top two in each heat advanced along with the fastest loser overall.

The top two from each heat and the faster of the two third place swimmers advanced.