Avalanche Software, LLC is an American video game developer, founded in October 1995 by four lead programmers from Sculptured Software. The company has developed for every console platform since the Mega Drive/Genesis and Super NES days and has grown to a staff of over 100 since its inception. The company is headed up by CEO John Blackburn.

The studio had been acquired by Disney in 2005, and spent the next ten years developing Disney-related titles, including the toys-to-life game Disney Infinity in 2013. By 2016, the toys-to-life market had started to falter, and Disney closed down the studio in May 2016.

The studio was acquired and re-opened by Warner Bros. on January 24, 2017, with Blackburn returning as CEO.