Big Nellie Mountain

{{Short description|Mountain in New South Wales, Australia}}

{{Use Australian English|date=September 2012}}

{{Use dmy dates|date=January 2021}}

{{Infobox mountain

| name = Big Nellie Mountain

| photo = Coorabakh National Park Big Nellie Mountain from Little Nellie.jpg

| photo_caption = Big Nellie Mountain, photographed from Little Nellie Mountain

| location = Taree, New South Wales, New South Wales, Australia

| range =

| elevation_m = 542

| elevation_system = {{AHD}}

| elevation_ref =

| type =Rhyolite{{cite web |title=COORABAKH NATIONAL PARK DRAFT PLAN OF MANAGEMENT| publisher= NSW National Parks and Wildlife Service| accessdate = 26 May 2018 |url=http://www.environment.nsw.gov.au/resources/parks/pomDraftCoorabakh.pdf}} or Trachyte{{cite web |title=Geological Sites of New South Wales, Lorne Basin, Lansdowne Escarpment and Big Nellie| publisher= Geomaps.com.au| accessdate = 26 May 2018 |url=http://www.geomaps.com.au/scripts/lornebasin.php}}

| age =Miocene

| map = Australia New South Wales

| range_coordinates =

| label_position = left

| map_size = 250

| map_caption=Location in New South Wales, Australia

| coordinates = {{coord|31.700556||S|152.522222||E|type:mountain_region:AU-NSW_scale:100000|format=dms|display=inline,title}}

|

}}

Big Nellie Mountain is a volcanic plug in the Mid North Coast region of New South Wales, Australia. It is situated {{convert|272|km}} northeast of Sydney, within Coorabakh National Park.