Holly Rachel Gibney is a fictional character created by American author Stephen King.

[3] She first appeared in Mr. Mercedes, where she is first shown as a brave and ethical shy recluse with many emotional issues and social awkwardness.

By the end of Mr. Mercedes her intelligence and courage play a major role in assisting main protagonist, Bill Hodges, to bring down the villain.

[6] Holly has been portrayed onscreen by Justine Lupe in Mr. Mercedes (which dramatised the three Bill Hodges novels), and by Cynthia Erivo in the miniseries adaptation of The Outsider.

Richard Price, the developer and showrunner of The Outsider reworked the character to some extent, without keeping the continuity with the Mr. Mercedes TV series or Bill Hodges novels (Price did not watch the series or read the novels), and asked King to rename the character, but he insisted on keeping the name Holly Gibney.