"Royal Flush" is a single by American rapper and OutKast member Big Boi. The track features fellow OutKast member André 3000 and Wu-Tang Clan member Raekwon. It was the first time the three rappers collaborated with each other in 10 years since "Skew It on the Bar-B" in 1998. The song was intended to be included as part of Big Boi's album Sir Lucious Left Foot: The Son of Chico Dusty, but was removed from it, due to legal complications from Big Boi resigning from Jive Records.
This song contains sampled elements from the song "Voyage to Atlantis" by The Isley Brothers between each verse. Big Boi refers to this when at the end of his verse he says, "take a voyage to Atlantis".
The song was nominated for Best Rap Performance by a Duo or Group at the 51st Grammy Awards.