Breslin grew up in Kirkintilloch, Scotland. She started writing as a teenager; writing about the closing of a nearby steel mill. She began writing for publication whilst employed as a librarian, and has published over 30 books.
Whispers in the Graveyard, published by Methuen in 1994, features a dyslexic boy. Breslin won the annual Carnegie Medal from the Library Association, recognising it as the year's best children's book by a British subject. Divided City (2005) is her 8th book for the Doubleday list. The Medici Seal, (August 2006) for which her research was extensive, with trips to study Leonardo da Vinci’s most famous works, including the Mona Lisa and The Last Supper. The Medici Seal is a tale of intrigue, murder and betrayal which follows the journey of Matteo as he travels with Leonardo across Italy on the Borgias' business. Matteo carries with him a secret – a secret that both the Borgia and the Medici families would kill to obtain.
- Simon's Challenge (1988)
- Different Directions (1989)
- Time to Reap (1991)
- Kezzie (1993)
- Bullies at School (1993)
- Whispers in the Graveyard (1994)
- Alien Force (1995)
- A Homecoming for Kezzie (1995)
- Missing (1995)
- Death or Glory Boys (1996)
- Name Games (1997)
- Across the Roman Wall (1997)
- Blair, the Winner! (1997) – four stories
- Name Games (1997)
- Bodyparts (1998)
- Starship Rescue (1999)
- Blair Makes a Splash (1999) – four stories
- The Dream Master (1999)
- Dream Master – Nightmare! (2000)
- Duncan of Carrick (2000)
- Gloryhole (2001)
- Remembrance (2002)
- New School Blues (2002)
- Dream Master – Gladiator' (2003)
- Prisoner in Alcatraz (2004)
- Dream Master – Arabian Nights (2004)
- Saskia's Journey (2004)
- Divided City (2005)
- The Medici Seal (2006)
- The Nostradamus Prophecy (2008)
- Prisoner of the Inquisition (2010)
- Spy for the Queen of Scotts (2012)
Awards and honours
- Winner of the Carnegie Medal for Children’s Literature - for Whispers in the Graveyard
- Awarded Honorary Membership of the Scottish Library Association for distinguished services to Children’s Literature and Librarianship, 2000
- Scottish Writers CD ROM (Project Manager) – Bafta nomination
- Selected for the American Library Association’s Best Books for Young Adults, and New York Public Library’s Books for the Teen Age 2003.
- Civic Award from Strathkelvin
- Winner of the Scottish Book Trust Best of the Decade Award
- Winner of Young Book Trust's Kathleen Fidler Award for Simon's Challenge
- Winner of the Sheffield Children's Book Award - longer novel
- Runners up, etc.
- The Children's Book Award (twice)
- The Angus Book Award
- The Lancashire Book Award
- The Moray Book Award
- North-East Book Award
- The Sheffield Book Award (twice)
- South Lanark Book Award
- The Stockton Book Award
- (Carnegie Winner 1994) Archived 2009-06-08 at the Wayback Machine. Living Archive: Celebrating the Carnegie and Greenaway Winners. CILIP. Retrieved 2012-08-17.
- "'Theresa Breslin's new book for teens, Caged, is an Oliver Twist for today'". HeraldScotland. Retrieved 2018-01-21.
- "Author Info". Theresa Breslin (theresabreslin.co.uk).
- "Author details | Scottish Book Trust". www.scottishbooktrust.com. Retrieved 2018-01-21.
- "Theresa Breslin - Literature". literature.britishcouncil.org. Retrieved 2018-01-21.