Debra Oswald has written for film, television, stage, radio and has also written children's novels. Her first play, Two-Way Mirror (1976), was written when she was 17, and was workshopped at the 1977 Australian National Playwrights Conference and broadcast on ABC Radio. She studied at the Australian National University and the Australian Film, Television and Radio School. Her play Gary's House has been included on the New South Wales secondary school drama syllabus as well as being shortlisted for the New South Wales Premier's Awards.
Oswald is also a prolific writer of Australian television series. These include the mini series Palace of Dreams (1985) as well as Dancing Daze (1986), Police Rescue (1991), Bananas in Pyjamas (1992), Wildside (1997), The Secret Life of Us (2001), and Outriders (2001). Her Police Rescue scripts have been nominated for AFI, AWGIE, and State Library awards. She also wrote the screenplay for the film Police Rescue (1994).