2005 Grand Prix Hassan II
Date	4–11 April
Edition	21st
Draw	32S / 16D
Prize money	$355,000
Surface	Clay / outdoor
Location	Casablanca, Morocco
Champions
Singles
Mariano Puerta
Doubles
František Čermák / Leoš Friedl
← 2004 · Grand Prix Hassan II · 2006 →

The 2005 Grand Prix Hassan II was an Association of Tennis Professionals men's tennis tournament played on outdoor clay courts in Casablanca, Morocco. It was the 21st edition of the tournament and was held from 4 April until 11 April 2005. Sixth-seeded Mariano Puerta won the singles title.

Finals

Singles

Mariano Puerta defeated Juan Mónaco 6–4, 6–1

• It was Puerta's only title of the year and the 6th of his career.

Doubles

František Čermák / Leoš Friedl defeated Martín García / Luis Horna 6–4, 6–3

• It was Čermák's 3rd title of the year and the 8th of his career. It was Friedl's 3rd title of the year and the 8th of his career.