Louis Dorren (1948 - October 26, 2014), commonly referred to as Lou Dorren, was an American sound engineer, music producer and inventor. He was also the owner of Bay Sound Records.

In 1969 Dorren invented the Quadraplex system of single station, discrete, compatible four-channel FM broadcasting. He founded Quadracast Systems, Inc. (QSI) of Palo Alto, California, United States to license his patents