WSAU may refer to:

• WSAU (AM), a radio station (550 AM) licensed to Wausau, Wisconsin, United States
• WSAU-FM, a radio station (99.9 FM) licensed to Rudolph, Wisconsin, United States since 2009
  • WSAU-FM was until 1969 the callsign of WIFC (95.5 FM) licensed to Wausau, Wisconsin, United States
• WSAU-TV, a television station (channel 7) licensed to Wausau, Wisconsin, United States from 1954 to 1981 when it was sold and the callsign changed to WSAW-TV