Mirren appeared in Michael Powell's "Age of Consent". This film was notable early role and contributed to raising her profile.

Mirren took on a variety of roles in both British and international films, demonstrating her range and versatility. These films included everything from thrillers to dramas, showcasing her ability to inhabit diverse characters. Some of her notable early film appearances include roles in 'O Lucky Man!' (1973) and 'Caligula' (1979).

Mirren starred alongside Bob Hoskins in 'The Long Good Friday', playing Victoria, the sophisticated and ambitious girlfriend of a London gangster. The film was well-received and cemented her reputation as a strong and capable actress.