The Royal Flush Gang were a family of bank robbers.
- The Royal Flush Gang depicted in Arrow are similar to the Joker's clown henchmen in The Dark Knight. They wear customized masks, make their first appearance by robbing a bank, and they manage to give the police the slip by putting masks on hostages.
- In DC comics, the Royal Flush Gang were criminals for hire, sometimes with an android Ace for muscle, who opposed the Justice League, and its individual members, on several occasions. In its later incarnation, it became another 'criminal octopus' similar to Intergang.