The 2004 ATP Buenos Aires was a men's tennis tournament played on outdoor clay courts at the Buenos Aires Lawn Tennis Club in Buenos Aires, Argentina and was part of the International Series of the 2004 ATP Tour. It was the 32nd edition of the tournament and was held from 16 February through 22 February 2004. First-seeded Guillermo Coria won the singles title.
See main article: 2004 ATP Buenos Aires – Singles. Guillermo Coria defeated Carlos Moyá 6–4, 6–1
See main article: 2004 ATP Buenos Aires – Doubles. Lucas Arnold / Mariano Hood defeated Federico Browne / Diego Veronelli 7–5, 6–7(2–7), 6–4