David Anderson, the ABC's managing director, has resigned after six years.
Anderson, first appointed in 2019, was reappointed in August 2023 for a five year term.
"I believe it is the right moment for leadership renewal for the next stage of the ABC's continued evolution," he said.
Kim Williams, who in march took over as chair from Ita Buttrose, praised Anderson for his service.
"I have observed to my ABC board colleagues that my admiration for David and his commitment to the ABC is undiminished and my respect grows ever greater," Williams said.
Anderson will stay until a new managing director is appointed, probably early 2025.
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