The 2005 Australian Open was a Grand Slam tennis tournament held in Melbourne, Australia from 17 until 30 January 2005. Roger Federer was unsuccessful in defending his 2004 title, being defeated in the semi-finals by eventual champion Marat Safin in a rematch of the 2004 final. Safin defeated third-seed Lleyton Hewitt in the final in four sets. Justine Henin-Hardenne could not defend her 2004 title due to an injury suffered in the second half of 2004. Serena Williams, the champion in 2003, defeated Lindsay Davenport in the women's final.

Seniors

Men's singles

🇷🇺 Marat Safin defeated 🇦🇺 Lleyton Hewitt, 1–6, 6–3, 6–4, 6–4

Women's singles

🇺🇸 Serena Williams defeated 🇺🇸 Lindsay Davenport, 2–6, 6–3, 6–0

Men's doubles

Wayne Black / Kevin Ullyett defeated 🇺🇸 Bob Bryan / 🇺🇸 Mike Bryan, 6–4, 6–4

Women's doubles

🇷🇺 Svetlana Kuznetsova / 🇦🇺 Alicia Molik defeated 🇺🇸 Lindsay Davenport / 🇺🇸 Corina Morariu, 6–3, 6–4

Mixed doubles

🇦🇺 Samantha Stosur / 🇦🇺 Scott Draper defeated Liezel Huber / Kevin Ullyett, 6–2, 2–6, [10–6]

Juniors

Boys' singles

🇺🇸 Donald Young defeated 🇰🇷 Kim Sun-yong, 6–2, 6–4

Girls' singles

🇧🇾 Victoria Azarenka defeated 🇭🇺 Ágnes Szávay, 6–2, 6–2

Boys' doubles

🇰🇷 Kim Sun-yong / Yi Chu-huan defeated Thiemo de Bakker / 🇺🇸 Donald Young, 6–3, 6–4

Girls' doubles

🇧🇾 Victoria Azarenka / 🇳🇿 Marina Erakovic defeated 🇨🇿 Nikola Fraňková / 🇭🇺 Ágnes Szávay, 6–0, 6–2

Legends

Men's doubles

Mixed doubles

Wheelchair

Men's singles

🇦🇺 David Hall defeated Robin Ammerlaan, 7–5, 3–6, 6-1

Women's singles

🇯🇵 Mie Yaosa defeated Maaike Smit, 7–6(5), 6-1

Men's doubles

Robin Ammerlaan / 🇦🇹 Martin Legner defeated 🇦🇺 David Hall / 🇦🇺 Anthony Bonaccurso, 6–4, 6–3

Women's doubles

Maaike Smit / 🇫🇷 Florence Gravellier defeated 🇨🇦 Yuka Chokyu / 🇯🇵 Mie Yaosa, 6–3, 6-3

Seeds

Withdrawals: 🇧🇪 Justine Henin-Hardenne, 🇧🇪 Kim Clijsters, 🇺🇸 Jennifer Capriati

Men's singles

Women's singles