The Secret Seven or Secret Seven Society is a fictional group of child detectives created by Enid Blyton. They appear in one of several adolescent detective series Blyton wrote.

The Secret Seven consists of Peter (the society's head), Janet (Peter's sister), Pam, Barbara, Jack, Colin and George. Jack's sister Susie and her best friend Binkie make occasional appearances in the books; they hate the Secret Seven and delight in playing tricks designed to humiliate them, although this is partly fuelled by their almost obsessive desire to belong to the society.

Unlike most other Blyton series, this one takes place during the school term time because the characters go to day schools.