Leon Byner (born 14 October 1946) is an Australian broadcaster who started his radio career in 1966 in Shepparton, Victoria, Australia. Byner currently hosts a morning talk show on radio station 5AA FIVEaa in Adelaide.
During his career Byner has worked on radio in every Australian state capital since. Byner switched from music presentation to talk radio in 1996 and has even done a couple of stints on Los Angeles talk stations in California. Byner has also presented segments for Adelaide local television on Australian and international celebrities. He has been nominated 13 times for ACRA awards (best talk and current affairs) and Australian of the Year three times.
On 25 October 2011 ACMA found that on 1 October 2010 Byner's show had breached the Commercial Radio Codes by presenting a paid advertisement to promote water purifiers as a current affairs item regarding the "dangers" of water fluoridation. FIVEaa were also found to have breached the complaint handling provisions as directed by the code.