Ai Haibara
- Name: Ai Haibara
- Real Name: Shiho Miyamo
- Age: 7?
- Address: 22/2 Beika Street, Tokyo Doctor Hiroshi Agasa's home.
- School: Tei Tan Primary School
- Class: Year 1 class B (in primary school)
- Profession:
- an ex member of the Secret Organisation
- a member of the Detecive Boys (LOL)
- Hobbies: Fashion
- Favourite Colour: Red
- First Appearence: File 6-10 of Volume 18, File 1 of Volume 19 and Episode 129.
- She was a member of the Secret Organisation and the inventor of the drug APTX4869 (which made Shinichi and herself small). Since she hid away from the organisation, she's been living in Dr. Agasa's home and continuing her work on the drug. She is now determined to find an anti-dope for the drug.