The lightweight class was a judo event held as part of the Judo at the 1964 Summer Olympics programme.

The weight class was the lightest contested, and allowed judokas of up to sixty-eight kilograms.

The competition was held on Tuesday, October 20, 1964.

[1] Twenty-five judokas from eighteen nations competed.

Pool D was the only one to require a playoff, which was won by Chang.