The 2005 Brasil Open was an ATP men's tennis tournament held in Mata de São João, Brazil.

It was the fifth edition of the tournament and was held from February 14 to February 21.

Rafael Nadal won the singles title.

[1][2][3] 1 Rankings as of 14 February 2005.

[5] The following players received wildcards into the main draw: The following players received entry from the qualifying draw: The following player received entry as a lucky loser: The following player received entry as a special exemption: The following pairs received wildcards into the main draw: Rafael Nadal defeated Alberto Martín 6–0, 6–7(2–7), 6–1 František Čermák / Leoš Friedl defeated José Acasuso / Ignacio González King 6–4, 6–4