Canberra barrister Robert Cook has been appointed a new magistrate for the ACT.

Mr Cook has more than 20 years experience in the legal profession, working the past three years as a barrister in the ACT.

He also spent 20 years in the Royal Australian Air Force where he held various positions including senior legal officer and prosecuting officer under the Defence Discipline Act.

Mr Cook fills the vacancy created by the appointment of David Mossop as Master of the ACT Supreme Court.

Attorney-General Simon Corbell say Mr Cook will be an asset to the Magistrates Court bench.

"The Magistrate's Court continues to manage its workload very effectively and sees no significant delays in any of its lists," he said

"The appointment however of Mr Cook is important given the promotion of Mr David Mossop to the position of master of the ACT Supreme Court and the appointment of Mr Cook will fill that vacancy in a timely manner.

"Mr Cook has extensive experience in administrative and civil law, in particular specialisation in employment law, and work health and safety law.

"This is certainly useful skills that he will bring to the Magistrates Court."

ACT Bar Association president Greg Stretton has also welcomed the swift appointment of Mr Cook.

"I'm delighted that there's been no real delay," he said.

"David Mossop was appointed as Master and Robert Cook will replace him.

"We're very grateful about the timeliness of that appointment by the Attorney-General."

Mr Cook is due to take up his new role mid-September.