The Boys' 81 kg tournament in Judo at the 2014 Summer Youth Olympics was held on August 18 at the Longjiang Gymnasium.

This event was the second-heaviest of the boys' judo weight classes, limiting competitors to a maximum of 81 kilograms of body mass.

The tournament bracket consisted of a single-elimination contest culminating in a gold medal match.

There was also a repechage to determine the winners of the two bronze medals.

Each judoka who had lost before the finals competed in the repechage with the two finalists getting bronze medals.