The thirty-fourth series of the British medical drama television series Casualty began airing on BBC One in the United Kingdom on 17 August 2019, one week after the end of the previous series. The series consists of 43 episodes. Lucy Raffety continues her role as series producer, while Simon Harper continues his role as the show's executive producer; this is Raffety's final series as producer, and she was replaced by Loretta Preece. Production on the series was postponed in March 2020 due to the COVID-19 pandemic, which also resulted in multiple transmission breaks. A single episode was also pulled due to comparisons between its content and the pandemic; the episode was broadcast as the final episode of the series at a later date. The theme of the series is reflecting how the National Health Service (NHS) is "under pressure", with elements focusing on "the hierarchy of pressure on the doctors". The series is also promoted through multiple trailers.

The thirty-third series of the British medical drama television series Casualty began airing on BBC One in the United Kingdom on 11 August 2018, one week after the end of the previous series. The series consisted of 46 episodes. Lucy Raffety continues her role as series producer, while Simon Harper continues his role as the show's executive producer. Sixteen regular cast members reprised their roles from the previous series. The series, which is billed as "The Year of the Paramedic", begins with a motorway collision stunt sequence, and features a crossover episode with spin-off series, Holby City. This series featured the departures of six cast members, including Amanda Mealing as Connie Beauchamp, Azuka Oforka as Louise Tyler and Chelsea Halfpenny as Alicia Munroe. Four new regular cast members also joined the series, while two actors began appearing in a recurring capacity.