Honor Blackman received elocution lessons for her 16th birthday (at her own request), and later attended the Guildhall School of Music and Drama, which she paid for by working as a clerical assistant in the Civil Service. She was also a dispatch rider for the Home Office during World War II, playing an important role in the war effort.

Blackman received her first acting work on stage in London's West End as an understudy in "The Guinea Pig". She continued with roles in "The Gleam" (1946) and "The Blind Goddess" (1947), before moving into film. She debuted with Fame Is the Spur (1947), starring Michael Redgrave.

Blackman suffered a nervous breakdown following a divorce, whose jealousy, fraudulent business practices, and emptying of her bank accounts took its toll. After hospitalisation Blackman began counselling, which would last for years, and began rebuilding her career.

TV series work also came her way again, most notably the highly popular The Avengers (1961), co-starring Patrick Macnee as John Steed. As the leather-clad "Catherine Gale", Blackman showcased her incredible beauty, self-confidence, and athletic abilities. Her admirable qualities made her not only a catch for the men, but also an inspirational figure for the 1960s feminist movement.

Blackman took on the role of Greek goddess Hera in the popular movie adventure Jason and the Argonauts (1963) with Ray Harryhausen and the melodrama Life at the Top (1965) with Laurence Harvey. She then played "Pussy Galore" in the classic James Bond film Goldfinger (1964). Blackman went toe to toe with Sean Connery's womanizing "007" and created major sparks on screen.

Blackman continued to work consistently in films and TV, while also appearing on stage where she earned rave reviews as the blind heroine of the thriller "Wait Until Dark" as well as for her dual roles in "Mr. and Mrs.", a production based on two of Noël Coward's plays. She also enjoyed working with actor Maurice Kaufmann in the play "Move Over, Mrs. Markham" and the film thriller Fright (1971). She proved a sultry-voiced sensation in various musicals productions such as "A Little Night Music", "The Sound of Music", "On Your Toes", and "Nunsense."

In the new millennium, Honor was seen in such films as Bridget Jones's Diary (2001), Colour Me Kubrick: A True...ish Story (2005), Reuniting the Rubins (2010), I, Anna (2012) and Cockneys vs Zombies (2012), as well as the British TV series Water, Water, Everywhere (1920) The Royal (2003) Coronation Street (1960), long running series Casualty (1986) and finally You, Me & Them (2013), her last role after her retirement several years earlier.

The ever-lovely and eternally glamorous star continued to find regular work into her 90s, including co-starring in the long-running English hit comedy series The Upper Hand (1990) and performing her one-woman stage show, "Wayward Women"

Honor Blackman died on April 5, 2020, in Lewes, Sussex. She was 94.