Public service jobs in New South Wales could be lost as the State Government considers reducing the number of state-run organisations.

NSW Treasurer Gladys Berejiklian will make her case for cuts in a speech to the Sydney Institute tonight.

Excerpts from the speech revealed the Government was looking at reducing its entities, which include departments, agencies, state-owned corporations, boards, committees and trusts.

The Treasurer ordered an expert panel to conduct an audit of the 870 organisations and present recommendations on how to make them "leaner and more efficient".

In the written speech, she said "many of these identified bodies overlap in terms of the functions they perform".

"There is an opportunity here to reduce this number," an excerpt said.

"Not for the sake of it — but because it will reduce waste, streamline decision-making and make Government work better."

She is expected to use an example relating to the 76 crown land trusts that manage assets, recommending a merger of the organisations.

"One of them manages a tennis court centre in Newcastle," an excerpt said.

"Another manages a small historic pumping station near Maitland.

"While the Government is yet to decide its exact course of action, the panel has recommended that these should not be separate trusts and should be merged into one."

Efficiency means job losses, Opposition says

Shadow Treasurer Michael Daley said New South Wales should be concerned by the Government's plan.

"When Liberal governments talk about making things more efficient they just mean sacking people and cutting services," he said.

But the Treasurer said the plan was about "more than simply saving money".

In the speech Ms Berejiklian cited her work as Transport Minister.

"One of my priorities was reforming the bureaucracy that delivers transport in NSW," the speech read.

"When I left the Transport portfolio, there were 2,000 fewer back-office staff in Sydney Trains and NSW Trains than there were in RailCorp when I arrived.

"At the same time, there were well over 1,100 extra services and customer satisfaction had increased."