KNX may refer to:
- KNX (AM), a radio station (1070 AM) licensed to Los Angeles, California, United States
- KCBS-FM, a radio station (93.1 FM) licensed to Los Angeles, California, United States, which used the call sign KNX-FM from May 1986 to March 1989
- KNX (standard), a home and building automation standard
- The IATA airport code for Kununurra Airport