The history of poker is a matter of some debate. The name of the game likely descended from the French poque, which descended from the German pochen ('to knock'), but it is not clear whether the games named by those terms were the real origins of poker. It closely resembles the Persian game of as nas, and may have been taught to French settlers in New Orleans by Persian sailors. It is commonly regarded as sharing ancestry with the Renaissance game of primero and the French brelan. The English game brag (earlier bragg) clearly descended from brelan and incorporated bluffing (though the concept was known in other games by that time). It is quite possible that all of these earlier games influenced the development of poker as it exists now.

English actor Joseph Crowell described the game as played in New Orleans in 1829: played with a deck of 20 cards, four players bet on which player's hand of cards was the most valuable. Jonathan H. Green's book An Exposure of the Arts and Miseries of Gambling (G. B. Zieber, Philadelphia, 1843) described the spread of the game from there to the rest of the country by Mississippi riverboats, on which gambling was a common pastime.