2005 ATP Buenos Aires
Date	7–14 February
Edition	33rd
Category	ATP International Series
Draw	32S/16D
Prize money	$355,000
Surface	Clay / outdoor
Location	Buenos Aires, Argentina
Venue	Buenos Aires Lawn Tennis Club
Champions
Singles
Gastón Gaudio[1]
Doubles
František Čermák / Leoš Friedl[2]
← 2004 · ATP Buenos Aires · 2006 →

The 2005 ATP Buenos Aires was an Association of Tennis Professionals men's tennis tournament held in Buenos Aires, Argentina. It was the 33rd edition of the event and was part of the International Series of the 2005 ATP Tour. The tournament was played on outdoor clay court and held from 7 February to 14 February 2005. Second-seeded Gastón Gaudio won the singles title.^[3]

Finals

Singles

Gastón Gaudio defeated Mariano Puerta 6–4, 6–4

• It was Gaudio's 2nd title of the year and the 7th of his career.

Doubles

František Čermák / Leoš Friedl defeated José Acasuso / Sebastián Prieto 6–2, 7–5

• It was Čermák's 1st title of the year and the 6th of his career. It was Friedl's 1st title of the year and the 6th of his career.