A girl who used to be called [[Miyano Shiho]] and was in the Black Organization under the code name Sherry. After the Organization kills her older sister [[Miyano Akemi]], Shiho takes the same drug that shrunk [[Kudou Shin'ichi]] and likewise becomes a child herself to escape, renaming herself Haibara Ai. She is blunt and cool-headed, but becomes frightened whenever the Organization is discussed or nearby.

Her name comes from fictional detective [[Cordelia Gray]] (灰 = gray) and Sherlock Holmes character [[Irene Adler]].
灰原哀