UIEvolution is a software company based in Bellevue, Washington. It was founded by Satoshi Nakajima in August 2000. In March 2004 UIEvolution was acquired by Square Enix for $58 million.

UIEvolution makes software for mobile phones. The software is based on a platform-independent middleware that allows applications to be easily ported from one mobile platform to another.

Some of the applications developed by UIEvolution include:

• The Chronicles of Narnia: the Lion, the Witch and the Wardrobe mobile game
• ESPN Bottomline mobile application
• Trivial Pursuit mobile game