Vegas Dream, released in Japan as Viva! Las Vegas (ビバ ラスベガス) is a gambling video game developed by HAL Laboratory for the Nintendo Entertainment System. A sequel, Vegas Stakes, was released for the Super Nintendo Entertainment System in 1993.

Vegas Dream begins with graphics showing one of the players arriving at Las Vegas by airplane. Featuring a backdrop of old downtown Las Vegas, players choose which of the two game modes to play: "Vegas Dream" (storyline version) or "One Spot" (strictly gaming, no storyline).

Players then start with a bankroll of $700 at the fictional HAL Palace Hotel, to spend on four games: Keno, Blackjack, Roulette or Slot machines. Between rounds of play at the normal casino games, there are randomly occurring social interactions with various characters, such as business people, other patrons, or casino employees (in the "Vegas Dream" version of the game only). These interactions (and the player's responses to them) have different possible results: sometimes the unidentified man is a pickpocket; other times he is just down on his luck and will reward the player's kindness down the road. The results of interactions are reported on a local Las Vegas news station; music with a cheery tone plays for positive happenings, such as the player receiving cash, with more somber music playing for thefts, injuries, etc.

Vegas Dream also allows the player to date and marry as many members of the opposite sex as desired; men marry a woman named Ms. Sophie while women marry a man named Mr. James. Marriage results in increased cash flow for the player, or a loss of funds from theft in the event that the married person is crooked.

There is a password save feature built into the game. The passwords are twenty-six characters long and consist of letters, numbers and symbols. The Japanese version, with gameplay identical to the North American version, uses slightly stronger language in its script and mentions cigarettes. The text within the Japanese version is also entirely in English.