The 2005 Medibank International was a tennis tournament played on outdoor hard courts. It was the 113th edition of the Medibank International, and part of the ATP World Tour 250 series of the 2005 ATP Tour, and of the WTA Premier tournaments of the 2005 WTA Tour. It was the 113th edition of the tournament and both the men's and the women's events took place at the NSW Tennis Centre in Sydney, Australia, from 9 to 15 January 2005.
| 2005 Medibank International | |
|---|---|
| Date | 9–15 January |
| Edition | 113th |
| Surface | Hard / Outdoor |
| Location | Sydney, Australia |
| Venue | NSW Tennis Centre |
| Champions | |
| Men's singles | |
 Lleyton Hewitt | |
| Women's singles | |
| Alicia Molik | |
| Men's doubles | |
 Mahesh Bhupathi / Todd Woodbridge | |
| Women's doubles | |
| Bryanne Stewart / Samantha Stosur | |
Finals edit
Men's singles edit
Lleyton Hewitt defeated 
Ivo Minář, 7–5, 6–0
Women's singles edit
Alicia Molik defeated Samantha Stosur, 6–7, 6–4, 7–5
Men's doubles edit
Mahesh Bhupathi / Todd Woodbridge defeated 
Arnaud Clément / Michaël Llodra, 6–3, 6–3
Women's doubles edit
Bryanne Stewart / Samantha Stosur defeated 
Elena Dementieva / 
Ai Sugiyama, walkover