The 2005 Movistar Open was an ATP men's tennis tournament held on outdoor clay courts in Viña del Mar, Chile that was part of the International Series of the 2005 ATP Tour.

It was the 12th edition of the tournament and was held from 31 January to 6 February 2005.

First-seeded Gastón Gaudio won the singles title.

Gastón Gaudio defeated Fernando González 6–3, 6–4 David Ferrer / Santiago Ventura defeated Gastón Etlis / Martín Rodríguez 6–3, 6–4