Mary-Claire Carter is a fictional character from the BBC medical drama Holby City, played by actress Niamh McGrady.

McGrady was promoted to a regular cast member in early 2013 by newly appointed executive producer, Oliver Kent - alongside the introductions of three characters.

Her first appearance, as a regular cast member, aired on 23 April when Mary-Claire received a staff nurse job on the AAU ward.

[9] McGrady became a fan of Holby City while she was in a relationship with fellow actor Jalaal Hartley, who played Tom O'Dowd in the show from 2008 to 2009.

[12] In February 2015, McGrady's co-star Jules Knight (who plays Mary-Claire's love interest, Harry Tressler) announced his departure from the show.

In the build-up to his exit, Mary-Claire had been offered as new job in Chicago by Colette Sheward (Louise Delamere) and Harry had been left facial disfigured following a fall from the hospital building.

[9] McGrady also revealed that show bosses waited until after she had returned from her break to write out both her and Knight's characters, commenting that it was a "good" decision and how "great" it was to see Mary-Claire and Harry develop prior to their exit.