Cross Gate is a massively multiplayer online role-playing game, developed by Dwango and published by Square Enix (originally Enix). It has been released in Japan, Taiwan, and mainland China since 2001.

It uses a traditional Japanese cartoon style and 2D graphics system with player characters pre-rendered in 3D. The battle style is turn-based resembling Dragon Quest series and players may choose to team up to a maximum of five players.

One of the distinctive features of this game is its "Creature System." Slightly similar to the Pokémon series, this game allows players to carry five creatures with them while traveling and place one creature fighting with them while battling. There is a character class specialized in catching those creatures and trading them in an open marketplace where players bid for the strongest, rarest, or cutest creatures. By assigning ability points to five different dimensions when the creature levels up, each player may grow his/her unique creatures.

There has been three official expansion packs released for this game, involving two additional developers in this MMORPG. On June 27, 2007, Square Enix announced that service of Cross Gate in Japan will be terminated at September 30, 2007. This will not affect the servers in China, Taiwan and Korea.

The sequel to the game, Concerto Gate, has finished its testing phase in Japan.