Reviews provided by RottenTomatoes
Few directors are capable of this kind of structural experimentation so late in their careers, and Hitchcock deserves much credit for his audacity.
New York Times:
Topaz is not only most entertaining. It is, like so many Hitchcock films, a cautionary fable by one of the most moral cynics of our time.
[Topaz] might appeal to devotees of Le Carre et al, but it certainly doesn't make for dramatically exciting cinema, especially given Hitchcock's flat, seemingly uninterested direction. The bland performances don't help much, either.
Topaz tends to move more solidly and less infectiously than many of Alfred Hitchcock's best remembered pix. Yet Hitchcock brings in a full quota of twists and tingling moments.