Deirdre Costello appeared on Coronation Street in four separate roles:
- Gina Fletcher, who worked as a housekeeper at 9 Coronation Street for Len Fairclough and Ray Langton in January 1971.
- Connie Parker, supervisor at Baldwin's Casuals in January 1988.
- Maggie, the proprietress of a cafe in Morecambe where Alison Wakefield was working in December 1999
- A Blackpool B&B Landlady in November 2003.
Her other credits include On the Buses, I Didn't Know You Cared, The Sweeney, Grange Hill and Emmerdale.