Men's 66 kg competition in judo at the 2000 Summer Olympics was held on 17 September at the Sydney Convention and Exhibition Centre.

[1] This event was the second-lightest of the men's judo weight classes, limiting competitors to a maximum of 66 kilograms of body mass.

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

The two judokas who lost in the semifinals faced the winner of the opposite half of the bracket's repechage in bronze medal bouts.

Since 23 judoka qualified for the repechage, one match was held to reduce the field to 22.