Bao Long is a character from the 2012 television special Lupin the 3rd: The Secret Page of Marco Polo. His name, written in Japanese as 包龍 and pronounced Pao Ryū, uses the Chinese pronunciation of Bao Long in both the original Japanese audio and the Italian dub. He was formerly a prominent and powerful crime boss, a figure of significant influence within the criminal underworld. However, by the time the events of the special unfold, he is no longer active in that role, having previously been sent to prison.

Bao Long's past directly connects him to the main antagonist, Bernardo Vilar, the president of Lombardo Heavy Industries. Before his imprisonment, Vilar had attempted to make a business deal with Bao Long. The deal fell through because Vilar sought to take one of Bao Long's own customers for himself. Bao Long politely declined this proposal, demonstrating a sense of business ethics or pride that would not allow such a poaching of his clientele. The customer in question was Duke Abel of the Talia Republic, an art collector who later became a senior advisor at Lombardo.

Within the story of The Secret Page of Marco Polo, Bao Long serves as a secondary figure whose past status is leveraged by the main villain. Vilar, who is aware of Bao Long’s identity and history, uses an underground casino that once belonged to the former crime boss as a key location. Vilar considers this casino the perfect place to humiliate a former crime boss, indicating that a central part of Bao Long's role in the narrative is to have his former domain and reputation desecrated by a rival. He does not appear as an active participant in the main chase for Marco Polo's legacy but exists as a figure whose past disgrace serves to highlight the ruthlessness of the primary antagonist. Beyond his past as a crime boss and his specific history with Vilar, no further details about his background, personality, motivations, or abilities are elaborated upon in the available information.