5MU is an adult hits-formatted commercial radio station based in Murray Bridge, South Australia.

5MU began after master engineer and World War I signaller Frank Miller was granted a broadcast license and began operation on 16 September 1934[1][2] as South Australia's second-ever radio station, with a wooden mast and antenna system.

[5][6] The station is known to be South Australia's longest serving callsign, being continuously known as 5MU right through their various frequency changes and as of September 2024 they run on FM.

[11] In November 2021, 5MU, along with other stations owned by Grant Broadcasters, were acquired by the Australian Radio Network.

This deal allows Grant's stations, including 5MU, to access ARN's iHeartRadio platform in regional areas.