Jac Naylor is a fictional character from the BBC medical drama Holby City, portrayed by actress Rosie Marcel. She made her first screen appearance during the series eight episode "Bird on a Wire", which was originally broadcast on 22 November 2005. The character is introduced alongside Luke Roberts and Tom Chambers as Joseph Byrne and Sam Strachan, respectively. Jac is characterised as a highly ambitious, forthright surgeon who is career-oriented. Her backstory states that her mother placed her in foster care aged twelve. Jac struggles to form relationships, but establishes rivalries and uses sexual manipulation to her benefit, engaging in romances with multiple colleagues.