ABC managing director David Anderson has announced his resignation after almost six years at the helm of the national broadcaster.

Mr Anderson was formally appointed as managing director in 2019, and says his decision to leave the position has not been an easy one.

"I am still very much committed to the importance of the ABC to the nation. I believe it is the right moment for leadership renewal for the next stage of the ABC's continued evolution," he wrote in an email to ABC staff on Thursday afternoon.

"To have the opportunity to serve the Australian public and lead such talented and dedicated people across the country, and overseas, for what is approaching six years is humbling. To have had this opportunity after a long career at the ABC is an achievement I am proud of and incredibly grateful for.

"The relationships forged with hard working people who possess a shared passion for the purpose and value of the ABC is an experience I will always cherish.

"It has been an absolute honour to be part of the ABC community. We are all custodians of this great national institution that has served Australians for over 90 years."

Mr Anderson says he will remain in the role until a new managing director is appointed, at the request of ABC chair Kim Williams.