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.
See main article: 2005 Medibank International – Men's singles. 
Lleyton Hewitt defeated 
Ivo Minář, 7–5, 6–0
See main article: 2005 Medibank International – Women's singles. Alicia Molik defeated Samantha Stosur, 6–7, 6–4, 7–5
See main article: 2005 Medibank International – Men's doubles. 
Mahesh Bhupathi / Todd Woodbridge defeated 
Arnaud Clément / Michaël Llodra, 6–3, 6–3
See main article: 2005 Medibank International – Women's doubles. Bryanne Stewart / Samantha Stosur defeated 
Elena Dementieva / 
Ai Sugiyama, walkover