The Secret Kingdom may refer to:
The Secret Kingdom (1916 film), an American film starring Charles Richman and Dorothy Kelly The Secret Kingdom (film), a 1925 British silent fantasy and science fiction film The Secret Kingdom (novel), a 1938 novel by Walter Greenwood The Secret Kingdom (TV series), a 1960 British television series based on the novel Das geheime Königreich (The Secret Kingdom), an opera by Ernst Krenek the premiered in 1928 "Secret Kingdom", a song from the 1976 British musical The Slipper and the Rose The Secret Kingdom (children's book), 2018 book by Barb Rosenstock