| 2025 | Grey | CILIP Carnegie Medals (Writing and Kate Greenaway Illustration) source ↗ (opens in a new tab) | Shortlist · Kate Greenaway Medal for Illustration | |
| 2015 | The New Small Person | Kirkus Prize source ↗ (opens in a new tab) | Finalist · Young Readers' Literature | |
| 2015 | The New Small Person | Chicago Public Library Best of the Best source ↗ (opens in a new tab) | Selection · Best Picture Books | |
| 2015 | The New Small Person | Kirkus Best Books of the Year source ↗ (opens in a new tab) | Selection · Picture Books | |
| 2012 | Ruby Redfort Look Into My Eyes | Chicago Public Library Best of the Best source ↗ (opens in a new tab) | Selection · Best Fiction for Older Readers | |
| 2010 | Slightly Invisible | The Guardian Best Books of the Year source ↗ (opens in a new tab) | Selection · Children's | |
| 2009 | Who Wants to Be a Poodle I Don't | The Guardian Best Books of the Year source ↗ (opens in a new tab) | Selection · Children's | |
| 2006 | But Excuse Me That Is My Book | School Library Journal Best Books of the Year source ↗ (opens in a new tab) | Selection · Best Books | |
| 2006 | The Princess and the Pea | School Library Journal Best Books of the Year source ↗ (opens in a new tab) | Selection · Best Books | |