Swimming at the 2003 World Aquatics Championships – Women's 100 metre backstroke

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Women's 100m Backstroke at the 2003 FINA World Aquatics Championships

Venue: Palau Sant Jordi, Barcelona, Spain
Dates: July 21 (prelims and semifinals) and July 22 (final)

Medalists:
- Gold: Antje Buschschulte (Germany)
- Silver: Louise Ørnstedt (Denmark)
- Bronze: Katy Sexton (Great Britain)

Overview:
This was part of the 10th FINA World Aquatics Championships. Prelim heats on the morning of July 21 whittled the field to the top 16 for the semifinals that evening. The eight fastest swimmers from the semifinals advanced to the final on July 22.