The 2005 Tennis Masters Cup was a tennis tournament played on indoor carpet courts. It was the 36th edition of the year-end singles championships, the 31st edition of the year-end doubles championships, and was part of the 2005 ATP Tour. It took place at the Qizhong Forest Sports City Arena in Shanghai, People's Republic of China, from November 13 through November 20, 2005.
David Nalbandian def. Roger Federer 6–7(4–7), 6–7(11–13), 6–2, 6–1, 7–6(7–3)
- It was David Nalbandian's 2nd title of the year, and his 4th overall. It was his 1st career year-end championships title.
Michaël Llodra / Fabrice Santoro def. Leander Paes / Nenad Zimonjić 6–7(6–8), 6–3, 7–6(7–4)
|Masters Grand Prix
ATP Tour World Championships
Tennis Masters Cup
ATP World Tour Finals