Belle (chess machine) was a chess machine built by Ken Thompson out of commodity hardware. Belle gave birth to a lot of current computer chess "tricks" such as endgame tablebases .

Belle (fiction) is a fictional character in Disney's Beauty and the Beast.

The word belle (a homophone of bell), of French origin, means a beautiful young woman. The word is typically used in the South, were women are sometimes affectionately known as Southern belles.

Belle (detector) is the name of the detector at the KEKB electron-positron collider, at the High Energy Accelerator Research Organisation (KEK) in Tsukuba, Ibaraki Prefecture, Japan.