Judo at the 2000 Summer Olympics – Women's 78 kg

These are the results of the Women's 78 kg (also known as half-heavyweight) competition in judo at the 2000 Summer Olympics in Sydney. A total of 23 women qualified for this event, limited to jūdōka whose body weight was less than, or equal to, 78 kilograms. Competition took place in the Sydney Convention and Exhibition Centre on 21 September.

Main bracket
The gold and silver medalists were determined by the final match of the main single-elimination bracket.

Repechage
The losing semifinalists as well as those judoka eliminated in earlier rounds by the four semifinalists of the main bracket advanced to the repechage. These matches determined the two bronze medalists for the event.