Fiona Gillies appeared on Coronation Street in December 2005 as Suzanne Seddon, wife of Sally Webster's cousin Paul and returned to the programme in January 2018 as the Judge at Anna Windass's trial for assaulting Seb Franklin.

Other television credits include roles in Mother Love, Perfect Scoundrels, The Detectives, Boon, Peak Practice, The Inspector Lynley Mysteries, Bad Girls, New Tricks, Holby City, Waking the Dead, Doctors, Casualty and PhoneShop, along with TV movies The Hound of the Baskervilles, Frankenstein, Casualty 1906 and the 2012 feature film City Slackers.

She married actor Michael Müller on 10th December 1991, and the couple have two children.