Santiago Ventura was the defending champion, but lost in the second round.
Mariano Puerta won the title, defeating Juan Mónaco 6–4, 6–1 in the final.
Seeds
Rainer Schüttler (first round) Filippo Volandri (semifinals) Luis Horna (first round) Fabrice Santoro (first round) Florian Mayer (second round) Mariano Puerta (champion) Gilles Müller (quarterfinals) Christophe Rochus (quarterfinals)
Draw
Finals
Top half
Bottom half
External links 2005 Grand Prix Hassan II Draw 2005 Grand Prix Hassan II Qualifying Draw