The 2005 SAP Open was a men's tennis tournament played on indoor hard courts.

It was the 117th edition of the event and was part of the International Series of the 2005 ATP Tour.

It took place at the HP Pavilion in San Jose, United States, from February 7 through February 13, 2005.

First-seeded Andy Roddick won his second consecutive singles title at the event.

[3] Andy Roddick defeated Cyril Saulnier, 6–0, 6–4 Wayne Arthurs / Paul Hanley defeated Yves Allegro / Michael Kohlmann, 7–6(7–4), 6–4