New South Wales Labor leader Luke Foley has pledged 4000 hectares of land in Sydney to the last disease-free koalas.
The Smiths Creek Reserve land, located in Campbelltown, could become a national park for around 400 chlamydia free koalas.
The disease, a different strain to the chlamydia affecting humans, is widespread among Australia's koala population and has devastating effects on the animals.
Labor has also promised to build infrastructure, including overpasses and fences, to protect the koalas from being hit by cars along major roads.