Gio Petré was born on November 1, 1937 in Stockholm, Sweden as Ann-Mari Birgitta Bengtsdotter Petré. She made her acting debut at 18, in "Flottans muntergökar" (1955). She was born into a family of artists. Gio Petré studied for a year at Gösta Terserus theatre school in Stockholm. In 1956 she was accepted at the Royal Dramatic Theatre School and graduated in 1959. The character she portrayed on the silver screen was often the sensual, provocative and dangerous blonde. Some of her more famous role interpretations in films are as "Mannequin" in "Vaxdockan", "Diana" in "Diana går på jakt" and as "Inger" in "Den onda cirkeln". Gio Petré has, up till now, appeared in 27 feature films and television productions.