Ethan Hardy is a fictional character from the BBC medical drama Casualty, played by actor George Rainsford. He first appeared in the series twenty-eight episode "Bad Timing", broadcast on 11 January 2014. Rainsford's casting was announced alongside Richard Winsor who had been hired to play Ethan's brother Caleb Knight. The pair were described by the show's executive producer Oliver Kent as completely different characters who would change the dynamic on Casualty. Ethan is a Specialist registrar in emergency medicine and is an excellent medic who had worked hard to achieve his position in the profession. He is characterised as a shy, socially awkward person with a serious and attentive attitude. Throughout his inclusion in the show Ethan has shared an on-screen friendship with like minded Lily Chao. He has had romantic stories alongside the character Honey Wright. Writers developed Ethan's relationship with his brother Cal into a sibling rivalry. This has provided both characters with dramatic stories.

The twenty-eighth series of Casualty began airing on BBC One on 3 August 2013, one week after the end of the previous series. This series consisted of 48 episodes, the highest episode order since series 24. The series concluded on 23 August 2014.