Fan-Tan, or fantan (simplified Chinese: 番摊; traditional Chinese: 番攤; pinyin: fāntān; Jyutping: faan1 taan1; lit. 'repeated divisions') is a gambling game long played in China. It is a game of pure chance.

The game is played by placing two handfuls of small objects on a board and guessing the remaining count when divided by four. After players have cast bets on values of 1 through 4, the dealer or croupier repeatedly removes four objects from the board until only one, two, three or four beans remain, determining the winner.

The game may have arisen during third and fourth centuries, during the period of the Northern and Southern dynasties. It then spread through southern China during the Qing dynasty. The name fantan dates back only to the mid-nineteenth century. Before that time, fantan was known as 掩錢; yǎnqián; 'covering coins', 攤戲; tānxì, 攤錢; tānqián, or 意錢; yìqián. It was prominent during the Late Qing and Republican period in Canton and the Pearl River Delta region. The game was also played in the Philippines under the name Capona.

After 1850, fantan spread overseas as a side effect of the massive Cantonese emigration. As a rule, in places where a significant number of Cantonese migrants could be found, fantan was also present. Fan-tan was very popular among Chinese migrants in America, as most of them were of Cantonese origin. Jacob Riis, in his famous book about the underbelly of New York, How the Other Half Lives (1890), wrote of entering a Chinatown fan-tan parlor: "At the first foot-fall of leather soles on the steps the hum of talk ceases, and the group of celestials, crouching over their game of fan tan, stop playing and watch the comer with ugly looks. Fan tan is their ruling passion." The large Chinatown in San Francisco was also home to dozens of fan-tan houses in the 19th century. The city's former police commissioner Jesse B. Cook wrote that in 1889 Chinatown had 50 fan-tan games, and that "in the 50 fan tan gambling houses the tables numbered from one to 24, according to the size of the room."

California amended Section 330 of the California Penal Code in 1885, adding fan-tan to its list of banned games; this coincided with the general rise of anti-Chinese sentiment in the United States, as fan-tan was considered a differentiating vice on par with opium use and the direct cause of property crime and violence. Raids on fan-tan parlors were regularly featured in contemporary news articles, with police in some cases posing as Chinese to infiltrate the games. In San Jose, California, a typo in a local printed law led to charges being dismissed against several bettors. Despite its illegality, it was estimated that 100 fan-tan parlors were operating in San Francisco's Chinatown around the turn of the 20th century.

Because of the police raids, fan-tan parlors adopted double-entrance security measures: after entering through the street doors, a bettor would have to pass through a hallway and a second interior set of doors. If the guard posted on the exterior doors did not recognize the prospective bettor or the guard raised an alarm in the event of a raid, the interior doors, often heavily reinforced with iron, would be shut and barred, giving the fan-tan patrons and parlor time to dismantle the game, conceal evidence, and flee the premises.

Fan-tan is no longer as popular as it once was, having been replaced by modern casino games like Baccarat, and other traditional Chinese games such as Mah Jong and Pai Gow. Fan-tan is still played at some Macau casinos.

The game is operated by two people: the "tán kún" or croupier, who stands by the table at position no. 1, and the "ho kún" (clerk or cashier), who stands to the left of the "tán kún".