The 2004 If Stockholm Open was an ATP men's tennis tournament played on hard courts and held at the Kungliga tennishallen in Stockholm, Sweden. It was the 36th edition of the event and part of the ATP International Series of the 2004 ATP Tour. The tournament was held from 25 October through 31 October 2004. Unseeded Thomas Johansson won the singles title.
See main article: 2004 If Stockholm Open – Singles. 
Thomas Johansson defeated 
Andre Agassi, 3–6, 6–3, 7–6(7–4)
See main article: 2004 If Stockholm Open – Doubles. 
Feliciano López / Fernando Verdasco defeated 
Wayne Arthurs / Paul Hanley, 6–4, 6–4