2025
January
26 January – International Day of Clean Energy
February
2 February – World Wetlands Day
11 February – International Day of Women and Girls in Science
March
1 March – World Seagrass Day
3 March – World Wildlife Day
3 March – Clean Up Australia Day
8 March – International Women's Day
14 March – International Day of Action for Rivers
20 to 26 March – Harmony Week
20 March – World Frog Day
20 March – National Close the Gap Day
21 March – Harmony Day
21 March – International Day for the Elimination of Racial Discrimination
21 March – National Ride2School Day
21 March – International Day of Forests
22 March – World Water Day
22 March – Earth Hour
23 March – National Eucalypt Day
23 March – World Meteorological Day
30 March – Zero Waste Day
April
17 April – International Bat Appreciation Day
18 April – International Day for Monuments and Sites (World Heritage Day)
22 April – Earth Day
25 April – ANZAC Day
May
2 May – World Tuna Day
3 May – Wild Koala Day
10 May – World Migratory Bird Day (day 1)
12 May – International Day of Plant Health
18 to 24 May – National Archaeology Week
20 May – World Bee Day
21 May – World Day for Cultural Diversity for Dialogue and Development
22 May – International Day for Biological Diversity
23 May – World Turtle Day
26 May – National Sorry Day
27 May to 3 June – National Reconciliation Week
31 May – World Parrot Day
June
3 June – Mabo Day
5 June – World Environment Day
8 June – World Oceans Day
15 June – Global Wind Day
15 to 21 June – Refugee Week
17 June – World Day to Combat Desertification and Drought
18 June – Sustainable Gastronomy Day
19 June – World Albatross Day
22 June – World Rainforest Day
23 to 30 June – World Female Ranger Week
July
July – Plastic Free July
6 to 13 July – NAIDOC Week
11 July – World Population Day
12 July – International Day of Combating Sand and Dust Storms
25 July – Schools Tree Day
26 July – International Day for the Conservation of the Mangrove Ecosystem
27 July – National Tree Day
31 July – World Ranger Day
August
4 August – National Aboriginal and Islander Children's Day
9 August – International Day of the World's Indigenous Peoples
10 to 18 August – National Science Week
12 August – International Youth Day
25 August – Australian South Sea Islander Recognition Day
September
September – Biodiversity Month
1 September – National Wattle Day
7 September – National Threatened Species Day
7 September – International Day of Clean Air for Blue Skies
16 September – World Ozone Day
20 September – World Cleanup Day
22 September – World Car-Free Day
26 September – World Maritime Day
28 September – World Rivers Day
October
2 October – World Habitat Day
4 October – World Animal Day
6 October – International Geodiversity Day
10 October – World Animal Road Accident Day
11 October – World Migratory Bird Day (day 2)
13 October – International Day for Natural Disaster Reduction
14 October – World Animal Road Accident Awareness Day
18 October – National Ride2Work Day
31 October – World Cities Day
November
3 November – International Day for Biosphere Reserves
10 November – World Science Day for Peace and Development
16 November – International Day for Tolerance
26 November – World Sustainable Transport Day
December
5 December – World Soil Day
5 December – World Volunteers Day
7 December – Tropical Tree Day
11 December – International Mountain Day
18 December – International Migrants Day