Swimming at the 2005 World Aquatics Championships – Women's 100 metre freestyle
The Women's 100m Freestyle event at the 11th FINA World Aquatics Championships was swum 28 – 29 July 2005 in Montreal, Quebec, Canada. Preliminary heats and Semifinal heats were 28 July; the final was 29 July.
At the start of the event, the existing World and Championships records were:
Preliminaries
Semifinals
Final
| Rank | Name | Nationality | Time | Notes |
| Jodie Henry |  Australia | 54.18 | |
| Malia Metella |  France | 54.74 | |
| Natalie Coughlin |  USA | 54.74 | |
| 4 | Amanda Weir | USA | 54.77 | |
| 5 | Marleen Veldhuis |  Netherlands | 54.90 | |
| 6 | Alice Mills | Australia | 54.92 | |
| 7 | Nery-Mantey Niangkouara |  Greece | 54.93 | |
| 8 | Daniela Gotz |  Germany | 55.27 | |
