The vegetation of Gundabooka National Park in North Western NSW was assessed using intensive quadrat sampling and mapped using extensive ground truthing and interpretation of aerial photograph and Landsat Thematic Mapper satellite images in 2015. Two hundred and seventy six species of vascular plants were recorded from this survey from 62 families. Species recorded from previous studies but not noted in the present study have been added to give a total of 298 vascular plant species for the Park including 31 (10%) introduced species. Twenty one vegetation communities were identified and mapped, the most widespread being Eucalyptus populnea / Acacia aneura / Acacia excelsa open woodland and Acacia aneura tall shrubland. VIS_ID 3969