Brian Williams is a Welsh musician, sound designer and film score composer. He has released albums under the name Lustmord starting in the 1980s and through the present.

Williams began as a recording artist within the industrial genre, working with Chris & Cosey and SPK. Shifting his work to Lustmord, Williams continued to employ the threatening aesthetics of industrial, while employing reverb and similar effects to evoke an atmosphere of cosmic horror. Starting with the 1989 album Heresy, Lustmord albums have been centered on manipulating sampled recordings with a computer. These samples infamously included field recordings made in locations such as crypts, caves, and slaughterhouses. Williams now downplays the sinister connotations of these locations and says they were picked for "acoustics".

The influence of Williams work on subsequent artists has led critics to call him "a reluctant pioneer of the dark ambient genre who regards his music as neither dark nor ambient."