1. Largest Islands

The islands larger than 1,000 square kilometres (390 sq mi) are:^[1][2]

• Tasmania (Tas) 64,519 square kilometres (24,911 sq mi);
• Melville Island, Northern Territory (NT), 5,786 square kilometres (2,234 sq mi);
• Kangaroo Island, South Australia (SA), 4,416 square kilometres (1,705 sq mi);
• Groote Eylandt (NT), 2,285 square kilometres (882 sq mi);
• Bathurst Island (NT), 1,693 square kilometres (654 sq mi);
• Fraser Island, Queensland (Qld), 1,653 square kilometres (638 sq mi);
• Flinders Island (Tas), 1,359 square kilometres (525 sq mi);
• King Island (Tas), 1,091 square kilometres (421 sq mi); and
• Mornington Island (Qld), 1,002 square kilometres (387 sq mi).

2. New South Wales

Bird Island, 1996

Cockatoo Island, the largest island in Sydney Harbour, 2008

Lord Howe Island, 2006

• Bare Island, near the north headland of Botany Bay
• Bird Island, located near Budgewoi, 1.4 kilometres (0.87 mi) east of the Central Coast
• Boondelbah Island, at the mouth of Port Stephens
• Broughton Island, located north of Port Stephens
• Broulee Island, located off the coast at Broulee
• Cabbage Tree Island, at the mouth of Port Stephens
• Chatsworth Island, in the Clarence River
• Clark Island, in Sydney Harbour
• Cockatoo Island, in Sydney Harbour, originally used as a prison and later developed as a shipyard
• Cook Island, located near Tweed Heads
• Dangar Island, a small forested island in the Hawkesbury River
• Dumaresq Island, a small island in the Manning River downstream of Taree
• Darling Island, a former island subsequently bridged by land, in Sydney Harbour
• Esk Island, in the north arm of the Clarence River
• Fatima Island, a tidal island of the Cook's River
• Fort Denison, also known as Pinchgut
• Five Islands Nature Reserve, a group of islands off the coast near Wollongong
• Garden Island (no longer an island)
• Glebe Island (no longer an island)
• Goat Island, a rocky island in Sydney Harbour
• Goodwood Island
• Green Island, a small island north of Smoky Cape
• Harwood Island, in the Clarence River
• Joass Island, located in Little Swan Bay, Port Stephens
• Lion Island, at the entrance to the Hawkesbury River
• Long Island, in the Hawkesbury River
• Lord Howe Island, a small island in the Tasman Sea, 600 kilometres (370 mi) east of the Australian mainland
  • Ball's Pyramid
  • Admiralty Group
• Milson Island, in the Hawkesbury River
• Montague Island, 9 kilometres (5.6 mi) east of Narooma on the south coast
• Moon Island, 1 km off Swansea Heads
• Muttonbird Island, off Coffs Harbour
• Oxley Island
• Pinchgut - see Fort Denison, a former penal site and defensive facility in Sydney Harbour
• Pulbah Island, the largest island in Lake Macquarie
• Rodd Island, a small island in the Parramatta River
• Scotland Island, in the north of Sydney
• Shark Island, in Sydney Harbour
• Snapper Island, in Sydney Harbour
• Spectacle Island, in the Hawkesbury River
• Spectacle Island, in Sydney Harbour
• Solitary Islands
• Wasp Island, the only island in Durras Inlet near Batemans Bay^[3]
• Wedding Cake Island, a small island of the coast of Coogee
• Windang Island, a small island at the entrance to Lake Illawarra
• Woodford Island, in the Clarence River on the far north coast

3. Northern Territory

• Bathurst Island
• Bickerton Island
• Crocodile Islands
• Croker Island
• East Woody Island
• Elcho Island
• Goulburn Islands
• Groote Eylandt - The name is an archaic spelling of the Dutch words for "Big Island" - Australia's 4th largest island
• Howard Island
• Martjanba Island
• Melville Island, the second largest island in Australia
• Quail Island
• Sir Edward Pellew Group
• Tiwi Islands
• Vanderlin Island
• Wessel Islands

4. Queensland

Fraser Island, 2006

Great Keppel Island, 2007

Whitehaven Beach, Whitsunday Island, 2008

• Acheron Island
• Agnes Island
• Albino Rock
• Aplin Islet
• Arnold Islets
• Baird Island
• Barber Island
• Barrow Island
• Bedarra Island
• Beesley Island
• Bird Islands
• Bishop Island^[4]
• Bootie Island
• Bountiful Islands
• Bowden Island
• Boyne Island
• Brampton Island
• Bribie Island
• Brisk Island
• Brook Islands, three islands: North, Tween and Middle.
• Bourke Isles
• Bushy Island
• Bushy Islet
• Cholmondeley Islet
• Clack Island
• Clerke Island
• Coconut Island
• Coochiemudlo Island
• Crab Island
• Cordelia Rocks
• Coquet Island
• Curacoa Island
• Denham Island
• Douglas Islet
• Duncan Islands
• Dunk Island
• Eagle Island
• Ellis Island
• Ephraim Island
• Esk Island
• Eclipse Island
• Fantome Island
• Falcon Island
• Fisher Island
• Fisherman Island (no longer an island - Port of Brisbane wharves construction in the mouth of the Brisbane River extended over it)
• Fitzroy Island
• Fly Island
• Frankland Islands
  • Russell Island
• Fraser Island, the largest sand island in the world
• Goold Island
• Gore Island
• Great Keppel Island
• Great Palm Island
• Green Island
• Haggerston Island
• Hales Island
• Hannibal Islands
• Harvey Island
• Heron Island
• High Island
• Hinchinbrook Island
• Horseshoe Island
• Houghton Island
• Hudson Island
• Jessie Island
• Kangaroo Island
• Kent Island
• King Island
• Kumboola Island
• Lady Elliot Island
• Lady Musgrave Island
• Leggatt Island
• Lindquist Island
• Lizard Island
• Lloyd Island
• Low Island
• Low Wooded Island
• Mabel Island
• Makepeace Island
• Magnetic Island
• Milman Islet
• Moreton Island
• Mornington Island
• Morris Island
• Mudjimba Island
• Murdock Island
• Nigger Head
• Newton Island
• Nob Island
• Noble Island
• Normanby Island
• North Direction Island
• North Stradbroke Island
• Northumberland Islands
• Orpheus Island
• Paddy Island
• Palfrey Island
• Peel Island
• Pelorus Island
• Pentecost Island
• Percy Island
• Perry Island
• Pigeon Island
• Pincushion Island
• Pipon Island
• Prince of Wales Island
• Pumpkin Island
• Raine Island
• Restoration Island
• Rocky Island
• Rocky Point Island
• Rodney Island
• Round Island
• St Helena Island
• Shaw Island
• Sherrard Island
• Sir Charles Hardy Islands
• The Sisters
• Sisters Islands
• Snapper Island
• South Direction Island
• South Stradbroke Island
• Southern Moreton Bay Islands
  • Russell Island
  • Macleay Island
  • Perulpa Island (Connected to Macleay Island by causeway)
  • Lamb Island
  • Karragarra Island
• Saibai Island, in the Torres Strait
• Stephens Island
• Struck Island
• Sunday Island
• Sunter Island
• Sweers Island
• Talbot Islands
• Tern Island
• Thomson Islet
• Thorpe Island
• Three Islands
• The Three Sisters
  • Sue Islet
• Torres Strait Islands
• Trochus Island
• Turtle Group
• Watson Island
• Wellesley Islands
• Wheeler Island
• Whitsunday Islands
  • Daydream Island
  • Dent Island
  • Hamilton Island
  • Hayman Island
  • Hook Island
  • Keswick Island
  • Lindeman Island
  • Long Island
  • South Molle Island
  • Whitsunday Island
• Wilson Island
• Woody Island

5. South Australia

Remarkable Rocks on Kangaroo Island, 2007

Greenly Island; a distant view taken from the sea (circa 1903) (State Library of South Australia PRG 280/1/1/120)

Chinamans Hat Island as viewed from the nearby coastline

View of Pearson Island from its south end circa 1914 (State Library of South Australia PRG-280-1-12-263)

5.1. Ocean Islands

• Althorpe Islands
  • Haystack Island
  • Seal Island (Investigator Strait)
• Beatrice Islets
• Bicker Isles
• Bird Islands
• Boston Island
• Busby Islet
• Casuarina Islets
• Chinamans Hat Island
• Curlew Island
• Douglas Rock
• Entrance Island
• Gambier Islands
• Garden Island
• Goose Island
• Granite Island
• Grantham Island
• Greenly Island
• Grindal Island
• Investigator Group
  • Flinders Island
  • Pearson Isles
    • Dorothee Island
    • Pearson Island
    • Veteran Isles
  • Topgallant Islands
  • Waldegrave Islands
  • Ward Islands
• Jones Island
• Kangaroo Island, Australia's third-largest island
• Liguanea Island
• Lipson Island
• Louth Island
• Neptune Islands
• Nicolas Baudin Island
• Nobby Islet
• Nuyts Archipelago
  • St Francis Island
  • St Peter Island
  • Smooth Island
• Middle Island
• Owen Island
• Paisley Islet
• Pelorus Islet
• Pullen Island
• Rabbit Island, Coffin Bay
• Rabbit Island, Louth Bay
• Rabbit Islet, Pelican Lagoon
• Royston Island
• St Francis Island
• St Peter Island
• Shag Island
• Sir Joseph Banks Group
  • Blyth Island
  • Boucaut Island
  • Dalby Island
  • Dangerous Reef
  • Duffield Island
  • English Island
  • Hareby Island
  • Kirkby Island
  • Langton Island
  • Lusby Island
  • Marum Island
  • Partney Island
  • Reevesby Island
  • Roxby Island
  • Seal Rock
  • Sibsey Island
  • Spilsby Island
  • Stickney Island
  • Winceby Island
• Seal Island (Encounter Bay)
• South Island
• Taylor Island
• Thistle Island
• Torrens Island
• Troubridge Island
• Tumby Island
• Unnamed island, Baird Bay
• Wardang Island
• Wedge Island
• Weeroona Island
• West Island
• Wright Island

5.2. Murray River Islands

• Hindmarsh Island
• Pomanda Island
• Rabbit Island, Coorong

6. Tasmania

Macquarie Island

Currie harbour on King Island, 2007

Tasmania is a large island state off the south-east coast of mainland Australia. The main island of Tasmania (which includes 94% of the state's land area) does not have a defined name but can be referred to as the "Tasmanian mainland". There are 334 islands (or islets) within the state of Tasmania;^[5] with the main islands listed below, each having a land area greater than 100 hectares (250 acres). A full list of all 334 islands is located at the list of islands of Tasmania.

• Bruny Island
• Furneaux Island Group
  • Anderson Island
  • Babel Island
  • Badger Island
  • Big Green Island
  • Cape Barren Island
  • Clarke Island
  • East Kangaroo Island
  • Flinders Island
  • Goose Island
  • Great Dog Island
  • Long Island
  • Mount Chappell Island
• Hogan Island
• Hunter Island Group
  • Hunter Island
  • Robbins Island
  • Three Hummock Island
• Kent Island Group
  • Deal Island
  • Dover Island
  • Erith Island
• King Island
• Maatsuyker Islands Group
  • Chicken Island
  • De Witt Island
  • Maatsuyker Island
• Macquarie Island
• Maria Island
  • Ile du Nord
• Partridge Island
• Petrel Island Group
  • Big Sandy Petrel Island
  • Big Stony Petrel Island
  • Little Stony Petrel Island
  • South West Petrel Island
  • Kangaroo Island
  • Howie Island
• Robbins Island
  • Walker Island (northwest)
• Rodondo Island
• Schouten Island
• Sloping Island Group
  • Sloping Island
  • Smooth Island (Tasmania)
• Waterhouse Island Group
  • Swan Island
  • Waterhouse Island

7. Victoria

Phillip Island, 2003

• Anser Island
• Barrallier Island
• Bennison Island
• Chinaman Island
• Churchill Island
• Corner Island
• Duck Island
• Elizabeth Island
• French Island
• Gabo Island
• Griffiths Island
• Joe Island
• Kanowna Island
• Lady Julia Percy Island
• Mud Islands
• Norman Island
• Phillip Island
• Raymond Island
• Rotamah Island
• Sandstone Island
• Shellback Island
• Snake Island
• Sunday Island
• Swan Island
• Tullaberga Island
• Mangrove Islet

7.1. River Islands

• Beveridge Island
• Coode Island
• Gunbower Island
• Herring Island
• Jordan's Island
• Pental Island

8. Western Australia

Rottnest Island, 2003

View of the Recherche Archipelago from Dempster Head

Middle Island, Recherche Archipelago 2011

Over 1,000 islands have been gazetted – only the island groups and major islands are listed.

• Ashmore Reef
• Barrow Island
• Bonaparte Archipelago
• Buccaneer Archipelago
  • Cockatoo Island
• Cape Leeuwin Islands
• Carnac Island
• Dampier Archipelago
• Dirk Hartog Island
• Garden Island
• Houtman Abrolhos
  • Easter Group
  • Pelsaert Group
  • Wallabi Group
• Lacepede Islands
• Lowendal Islands
• Mary Anne Group
• Montebello Islands
• Recherché Archipelago
• Rottnest Island
• Rowley Shoals
• Scott and Seringapatam Reefs
• Shark Bay islands
• Wedge Island

9. Australian Territories

9.1. Jervis Bay Territory

• Bowen Island

9.2. Australian Capital Territory

• Aspen Island
• Pine Island
• Spinnaker Island
• Springbank Island

10. External Territories

Norfolk Island, 2007

• Ashmore and Cartier Islands
• Australian Antarctic Territory^[6]
  • Achernar Island
  • Masson Island
  • Hawker Island
  • Frazier Islands
  • Giganteus Island
• Christmas Island
• Cocos (Keeling) Islands
  • Horsburgh Island
  • Home Island
  • North Keeling Island
  • West Island
• Coral Sea Islands
  • Cato Island
  • Elizabeth Reef
  • Middleton Reef
  • Willis Island
• Heard Island and McDonald Islands
• Norfolk Island
  • Nepean Island
  • Phillip Island