Alex Patricio Calatrava (born June 14, 1973 in Cologne, Germany) is a former tour tennis player from Spain, who turned professional in 1993. The right-hander won one singles title (2000, San Marino). He reached his highest singles ATP-ranking on February 12, 2001, when he became World Number 44.

Calatrava defeated up and coming British star Alex Bogdanovic in 5 sets at Wimbledon Championships in 2004.

In July 2005 Calatrava was humbled by an emerging young talent from Serbia. The player in question was Novak Djokovic. The Serb dispatched Calatrava nonchalantly 6-1, 6-4 success in Umag, Croatia.

Calatrava was born in Germany while his parents lived there, returning to Spain live in 1980. His Spanish father, Jose, met his French mother, Gabrielle, while working Germany. Calatrava's uncle is the renowned architect Santiago Calatrava.

Calatrava lived in California from 1989 to 1991 and attended a high school for one year in Palm Springs. He also lived a year in Indian Wells under the guidance of Spanish coach José Higueras. He was the number one ranked junior player in California in 1991.