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Who Wants to Be a Millionaire (colloquially referred to as simply Millionaire) is an American television game show based on the format of the same-titled British program created by David Briggs, Steven Knight and Mike Whitehill and developed in the United States by Michael Davies. The show features a quiz competition with contestants attempting to win a top prize of $1,000,000 by answering a series of multiple-choice questions, usually of increasing difficulty. The program has endured as one of the longest-running and most successful international variants in the Who Wants to Be a Millionaire? franchise.

The show has had numerous format and gameplay changes over its runtime and, since its debut, twelve contestants and four separate teams of two contestants (twenty people combined, seven of which were celebrities) have answered all the questions correctly and won the top prize (two other contestants also won one million dollars in special editions of the show). As the first American network game show to offer a million-dollar top prize, the show made television history by becoming one of the highest-rated game shows in the history of American television. The American Millionaire won seven Daytime Emmy Awards, and TV Guide ranked it No. 6 in its 2013 list of the 60 greatest game shows of all time.

At its core, the game is a quiz competition in which the goal is to correctly answer a series of 15 (14 from 2010–2019) consecutive multiple-choice questions. The questions are of increasing difficulty, except in the 2010–15 format overhaul, where the contestants were faced with a round of 10 questions of random difficulty, followed by a round of four questions of increasing difficulty. Each question is worth a specific amount of money; the amounts are not cumulative. Many questions from number 6 onward often prompt the host to ask if the answer they gave is their "final answer" – if it is, then it is locked in and cannot be changed. If at any time the contestant gives a wrong answer, the game is over and the contestant's winnings are reduced to $0 for tier-one questions, $1,000 for tier-two questions, and $32,000 for tier-three questions. However, the contestant may choose to walk away after being presented with a question, allowing them to keep all the money they have won to that point; afterwards (in most cases) the host will usually ask them to state what answer they would have gone for if they had continued, and reveal if it would have been correct or incorrect. With the exception of the shuffle format, upon correctly answering questions five and ten, contestants are guaranteed at least the amount of prize money associated with that level.

From 1999–2002, 10 contestants played a round of Fastest Finger to determine who played next. The participants were presented with one question and four answers and attempted to put the four answers in a certain order (ascending, chronological, etc.) in the fastest time. The contestant who did so correctly in the fastest time played. If no contestant got the correct order, the round was played again, and when a tie occurred, the tied participants answered a second Fastest Finger question. This round was removed when the syndicated version began in 2002, though it returned in 2004 for Super Millionaire. The format remained unchanged, except for changes to the money staircase and the addition of a new lifeline, until 2008. When the show returned to ABC in 2020, the original format used from 1999–2004 was used, albeit with slightly different lifelines and the Fastest Finger round once again being removed.

The guaranteed amounts for correctly answering questions five and ten were $1,000 and $32,000, respectively, for the entirety of the network run and the syndicated version from 2002 to 2004. The Super Millionaire specials in 2004 had guarantees of $5,000 and $100,000, respectively. Beginning in 2004 on the syndicated version, the upper guarantee was decreased to $25,000 at the same time a fourth lifeline was added; the 10th Anniversary specials also followed suit.

In 2008, the format was altered to include a time limit on each question. The amount of time for each question was as follows:

Questions 1–5: 15 seconds

Questions 6–10: 30 seconds

Questions 11–14: 45 seconds

Question 15: 45 seconds, plus the total of all unused time from the previous 14 questions

Unlike past formats, the four answer options would be revealed simultaneously, and the timer would begin to run immediately afterward (while the host was still reading the answers). The contestant had to give a final answer before the timer reached 0. The timer temporarily paused if the contestant used a lifeline and restarted once the lifeline ended. If time ran out, the game ended and the contestant left with whatever money they had won up to that point, in the same manner as walking away