A lawyer who began her career in Canberra will return to the capital as a new Associate Judge of the ACT Supreme Court.

Attorney-General Gordon Ramsay on Friday appointed Verity McWilliam to the vacancy created after David Mossop was elevated to Resident Judge of the court.

Ms McWilliam grew up in Canberra before studying law at the Australian National University and starting her career at a local firm.

She has practiced at the NSW Bar since 2006 and previously worked as an associate to two Federal Court judges, a solicitor in the NSW Crown Solicitor's Office and for PwC Legal in Sydney and DLA Piper in London.

Ms McWilliam is also an adjunct lecturer in public law at the University of NSW.

Mr Ramsay said Ms McWilliam was highly regarded and he was confident she would make a valuable contribution to the court.

He said she also retained a strong connection to Canberra with family and friends in the capital.

Ms McWilliam has practiced across civil litigation areas including administrative law, commercial, employment and environmental and planning law, as well as criminal law.

"I am certain the ACT community will be well served by Ms McWilliam as the new Associate Judge," Mr Ramsay said.

Her appointment starts on June 26, with a ceremonial sitting to be held the same day.