The Baby-Sitters Club (also known as BSC) is a series of novels written by Ann M. Martin and published by Scholastic between 1986 and 2000, that sold 176 million copies. Martin wrote the first 35 novels in the series, but the subsequent novels were written by ghostwriters, such as Peter Lerangis. The Baby-Sitters Club is about a group of friends who live in the fictional, suburban town of Stoneybrook, Connecticut. These friends run a local babysitting service called "The Baby-Sitters Club". The original four members were Kristy Thomas (founder and president), Mary Anne Spier (secretary), Claudia Kishi (vice-president), and Stacey McGill (treasurer), but the number of members varies throughout the series. The novels are told in first-person narrative and deal with issues such as illness, moving, and divorce.

As the series progressed, Dawn Schafer (Alternate Officer), Mallory Pike and Jessi Ramsey (Junior Officers), Logan Bruno (Associate Member), Shannon Kilbourne (second Associate Member and, later, temporary substitute Alternate Officer), and Abby Stevenson (replacement Alternate Officer for Dawn) joined the club.