Phantasy Star II is a science fantasy role-playing video game developed and published by Sega for the Sega Genesis. It was released in Japan in 1989, North America in 1990, and in Europe in 1990. It was later ported to a variety of different platforms. An updated remake, Phantasy Star Generation 2, was released for the PlayStation 2 in 2005 in Japan.

A role-playing video game, a role-playing game (RPG) or computer role-playing game (CRPG), is a video game genre where the player controls the actions of a character immersed in some well-defined world, usually involving some form of character development by way of recording statistics. Many role-playing video games have origins in tabletop role-playing games and use much of the same terminology, settings, and game mechanics. Other major similarities with pen-and-paper games include developed story-telling and narrative elements, player character development, complexity, as well as replay value and immersion. The electronic medium removes the necessity for a gamemaster and increases combat resolution speed. RPGs have evolved from simple text-based console-window games into visually rich 3D experiences.