The NSW Liberals have promised thousands more nurses and midwives.

The Liberals’ latest pre-election sweetener is a promise to hire thousands of extra nurses and midwives across the state's hospitals.

NSW Premier Gladys Berejiklian says 5,000 nurses and midwives would be recruited over four years as part of a boost of 8,300 new frontline staff.

Some 45 per cent that additional staffing has been pledged for regional NSW.

The $2.8 billion promise will ensure “world-class” service across NSW hospitals, Ms Berejiklian said.

“Without [frontline staff] the patients can't get that world class health service, without them hospitals don't run efficiently, without them we can't provide the services people expect day in and day out,” she told reporters in Sydney on Sunday.

NSW Health Minister Brad Hazzard said it would make a “huge difference”.

“Our hospitals are leading the country already but this massive boost of staff will mean the staff are so much more comfortable in the work they are doing in our incredible hospitals,” Mr Hazzard said.

The 8,300-person hiring drive would include 1,060 doctors, 880 additional allied health staff including pharmacists, physiotherapists and psychologists and 1,360 hospital support staff.

It is contingent on the Liberals winning the upcoming NSW election.

The state’s Labor opposition quickly pledged that it “can and will match the commitment of 5,000 more nurses”.

“Labor will be making further announcements in the coming weeks,” opposition health spokesperson Walt Secord said.