The Gelatinous Cube is one of the most famous of the creature-type known as "oozes" in the fantasy rolelplaying series Dungeons & Dragons.

Although officially of the "neutral" alignment, the Gelatinous Cube is dangerous to organic life forms due to its ability to absorb with frightening effectiveness most types of organic life.

Gelatinous Cubes are 10 feet in size and frequently slither across dungeon corridors, absorbing anything that gets in their path. In the earlier versions of the game they were especially dangerous as most early dungeons were around 10 ft by 10 ft.