The Thief Lord is a concept appearing different times in the Cornelia Funke universe. It may refer to:
- The Thief Lord, a 2000 children's novel by German author Cornelia Funke
- The Thief Lord, a 2006 family film based on the novel of the same name by Cornelia Funke
- Scipio Massimo, who called himself "The Thief Lord", one of the main characters in The Thief Lord (novel)
- Ernesto Barbarossa, who, after being reverted to being a child due to the magic merry-go-round, forces his peers in the boarding school he is sent to attend to call him "The Thief Lord"