Mr Cocks, a former federal public servant and policy convenor for the Canberra Liberals, will also take on regulatory services, and jobs and workplace affairs.

Ms Lee said she expected Mr Cocks would hit the ground running in his new portfolios.

"Ed brings a wealth of experience with him to the Assembly across several areas, in particular through his time working in the Australian Department of Health with a strong focus on mental health," Ms Lee said in a statement on Monday morning.

Mr Cocks said he was honoured to take on the mental health portfolio for the opposition.

"I have been passionate about improving our mental health system for a long time, and dedicated much of my APS career to developing mental health policy," Mr Cocks said.

"Canberrans face significant barriers to accessing mental health care in the ACT, and I look forward to contributing to positive, practical solutions."

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The mental health portfolio was previously held by Leanne Castley, a member for Yerrabi. Ms Castley retains the health portfolio in the reshuffle.

Mr Cocks takes responsibility for jobs and workplace affairs and regulatory services over from the shadow attorney-general, Peter Cain.

Mr Cain will now be responsible for multicultural affairs, taking over the portfolio from Giulia Jones, a former deputy opposition leader who resigned from the Legislative Assembly in June.

Deputy Opposition Leader Jeremy Hanson will now be responsible for early childhood education, Mrs Jones' other responsibility area after she resigned from the deputy leadership in January.

Every Canberra Liberals Assembly member has responsibilities in shadow cabinet.

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