What is the name of the audio post-production division of Lucasfilm?

The audio post-production division of Lucasfilm is Skywalker Sound.

Founded by George Lucas in 1975 as Sprocket Systems, the division handles sound effects, sound editing, sound design, mixing, and music recording. Its main facilities are at Skywalker Ranch in Lucas Valley, California.

Skywalker Sound helped establish the sound of modern blockbuster cinema, contributing to productions such as Star Wars, Indiana Jones, Jurassic Park, and many other films. Its work includes creating memorable effects as well as refining dialogue, ambience, and musical recordings.

A common mix-up is Industrial Light & Magic, or ILM, which is Lucasfilm’s visual-effects division. Skywalker Sound is the separate Lucasfilm unit devoted to audio, although both companies have frequently collaborated on the same films.