The Girlfriend was filmed in multiple locations including Málaga, Andalucía, Spain (including episodes 2 and 4 shot in Malaga), various spots in London, England (such as St. Ermin’s Hotel in Westminster, 59 Marlborough Place in St. John’s Wood, Soho, and Syon House in Brentford), and Shepperton Studios in Surrey, England. Additional filming occurred in places like Ronda and Marbella in Spain, as well as a quarry near Chepstow in the UK. The production used these diverse locations to create the distinct visual identities needed for the series, blending urban and natural environments effectively.