NSW Treasurer Dominic Perrottet says the state should have a dedicated minister for Sydney "to talk up our city" to ensure it gets the same global recognition as London or Paris.

Speaking at a Committee for Sydney boardroom lunch on Thursday, Mr Perrottet said too often there was a reluctance to boast about the city.

Treasurer Dominic Perrottet. Credit:Edwina Pickles

"When Sydney goes well, regional NSW goes well and Australia goes well," he said.

"Everyone in NSW and Australia are shareholders in Sydney's success. We shouldn't be afraid to talk up Sydney - we have an obligation to invest in it as Australia's only truly global city and our nation's gateway to the world."