The Thief Lord (German: Herr der Diebe) is a 2006 German-British family drama film written and directed by Richard Claus and co-written by Daniel Musgrave, based on the 2000 novel of the same title, by German author Cornelia Funke.

The film follows two recently orphaned brothers, Bo (Jasper Harris) and Prosper (Aaron Johnson), dumped in the care of a cruel aunt and uncle, who escape their impending separation by running off to Venice.

Hiding in the canals and alleyways of the city, the boys are befriended by a gang of young urchins and their enigmatic masked leader, the Thief Lord (Rollo Weeks).

The Thief Lord invites the boys to come to his hideout, an abandoned cinema called the Stella, which is also home to three orphaned children Scipio has rescued: Hornet, Riccio, and Mosca.

Meanwhile, the boys' aunt and uncle, Esther and Max Hartlieb have traveled to Venice to find their nephews and hired Victor Getz to help.

Scipio's newest client, a mysterious man known as the Conte, asks them to steal a wooden wing, a fragment of the long-lost merry-go-round of the Merciful Sisters.

When the gang go to steal the wooden wing, they accidentally wake the owner of the house, Ida Spavento.

That night, Scipio sneaks out of his father's mansion and persuades Prosper to come with him to ride the merry-go-round and become an adult.

The one-disc edition includes a theatrical trailer that ran in theatres in Europe and Mosca's cartoon from the film by itself.