Setzer Gabbiani (Japanese: セッツァー・ギャッビアーニ, Hepburn: Settsā Gyabbiāni) is a character introduced in the 1994 role-playing video game Final Fantasy VI by Square Enix. A gambler with an airship casino, he originally plots to kidnap the starlet of an opera, before he is coerced into joining the protagonists in their quest to stop the game's Gestahlian Empire. Created by Tetsuya Nomura, he was based on a character class he had originally planned for the game's preceding title, Final Fantasy V. He has since appeared in other titles related to the Final Fantasy franchise, including Kingdom Hearts II, where he is voiced by Crispin Freeman in English, and Ryōtarō Okiayu in Japanese.

Reviewers regarded Setzer as one of the best characters in the game due to his personality and nature, and unique among the series due to being driven by his own desires and ambitions. However this has also earned him some criticism, seen as a "scumbag" by some reviewers, albeit one that improves once he joins the rest of the game's playable cast. Particular praise was given to his story in the game's second half, where he shares a personal tragedy, a moment that some saw as providing much-needed humanization for his character.

Setzer Gabbiani is a character in the 1994 Square Enix video game Final Fantasy VI. Fighting using dice, darts and thrown playing cards, he is a renowned gambler and owner of the Blackjack, an airship-based casino. The protagonists, in need of an airship, discover that he plans to kidnap the star of an upcoming opera. Realizing one of the women in their group, Celes, resembles the starlet, she poses as her to entrap Setzer. When he arrives, she makes a coin-flip wager with him that she'll go with him if he wins, and if he loses he joins the protagonists in their opposition of the game's Gestahlian Empire. Setzer agrees and loses the wager, though upon discovering it was a two-headed coin joins the group regardless, both due to the harm the Empire is doing to his lifestyle and respecting Celes' willingness to use underhanded tactics.

However, at the conclusion of the game's first half the world has been devastated, the party separated, and the Blackjack destroyed. Celes finds Setzer drinking heavily in despair, but encourages him to keep going. He takes the group to the tomb of his friend Darril and reveals his past as they descend the staircase into it: originally, the two of them used their airships to compete to be the fastest people in the world. However, her ship crashed after a test flight, and Setzer recovered it and rebuilt it at the site of her grave. Her ship taking flight once more with Setzer in command, the group proceeds to try and find the rest of their allies to take on the game's main antagonist, Kefka.

In other games, Setzer appears as a playable character in Final Fantasy Brave Exvius, Final Fantasy Record Keeper, and Dissidia Final Fantasy Opera Omnia. He also appears in Kingdom Hearts II as the reigning champion of the false Twilight Town's Struggle tournament, where he fights the character Roxas. He can also challenge Sora in the real Twilight Town in an optional sidequest. In Kingdom Hearts, he is voiced by Ryōtarō Okiayu in Japanese and Crispin Freeman in English, with Okiayu reprising the role for Opera Omnia. Outside of video games, cards representing Setzer have been produced for the Final Fantasy Trading Card Game and Magic: The Gathering.

Final Fantasy VI was developed with the mindset that none of the playable cast was the protagonist, and that each of them were equally the "main character". The cast of characters were selected from submissions from across the development team, with artist Tetsuya Nomura contributing the character based on a character concept he had wanted to use previously. Once the cast was selected, each individual would write their character's story, with Yoshinori Kitase balancing the plot as things developed.

Standing 175 cm (5 ft 9 in) tall, an early draft of the character's appearance was drawn by Nomura, while Yoshitaka Amano was commissioned to design the characters from the brief outlines provided. Given full creative freedom, Amano wanted to make "real" and "alive" characters, though with consideration for their representation in-game as small computer sprites. However, according to series creator Hironobu Sakaguchi and pixel artist Kazuko Shibuya, most of the characters were designed by Shibuya first as sprites. Though Shibuya acted as an intermediary between Amano and the development team, this resulted in discrepancies between Amano's concepts and the game itself. Setzer appears as a pale man with long white hair, a black suit with lavender boots, and a black jacket with a gold trim. He additionally has a blue sash around his waist, and a white ascot on his neck. His face and body are heavily scarred, due to "accidents on the airship" but also to reflect the difficulties of his life as a gambler.

The Gambler concept was originally a character class intended for Final Fantasy V, however the team felt it had too much "individuality". When work began on VI Nomura felt it was more suitable there as the game's theme was to highlight the individuality of the cast. In terms of personality, he is described as someone calm in almost any situation and in control of their emotions, though tends to use "clumsy phrasing", sometimes on purpose. Additionally they wanted Setzer to put heavy emphasis on his sense of fashion, and desire to have a unique look, similar in attitude to a rock and roll musician. One particular way to illustrate this was with a Bandana item the character has in his inventory, despite being unable to equip it; the team intended it as environmental storytelling, where Setzer, upon seeing the character Locke also wearing a bandana, refuses to wear it again to not share the same style.