| Environmental Date | Date(s) |
|---|
| National Bird Day | January 5 |
| International Zebra Day | January 31 |
| World Wetlands Day | February 2 |
| World Ostrich Day [3] [4] | February 2 |
| World Marmot Day [5] [6] | February 2 |
| World Pangolin Day [7] [8] | Third Saturday of February |
| World Whale Day [9] | Third Sunday of February |
| World Bonobo Day [10] [11] [12] | February 14 |
| World Lizard Day [13] [14] | February 8 |
| World Hippopotamus Day [15] | February 15 |
| International Polar Bear Day | February 27 |
| World Wildlife Day | March 3 |
| International Day of Action for Rivers | March 14 |
| World Consumer Rights Day | March 15 |
| Buzzards Day [16] [17] | March 15 |
| Digital Cleanup Day [18] | March 15 2025 |
| National Panda Day [19] [20] [21] | March 16 |
| Global Recycling Day [22] | March 18 |
| World Serval Day [23] | March 18 |
| Taxonomist Appreciation Day [24] | March 19 |
| World Sparrow Day | March 20 |
| World Frog Day [25] [26] [27] | March 20 |
| World Rewilding Day [28] | March 20 |
| International Day of Forests | March 21 |
| World Planting Day [29] [30] [31] | March 21 |
| World Wood Day [32] | March 21 |
| World Water Day | March 22 |
| International Seal Day [33] | March 22 |
| World Meteorological Day | March 23 |
| International Day of Zero Waste [34] | March 30 |
| World Aquatic Animal Day [35] | April 3 |
| World Rat Day [36] [37] [38] | April 4 |
| International Beaver Day [39] [40] | April 7 |
| Zoo Lovers Day [41] [42] | April 8 |
| Arbor Day | April 26 |
| Bat Appreciation Day [43] [44] | April 17 |
| Earth Day | April 22 |
| International Pallas's Cat day [45] [46] [47] | April 23 |
| World Day for Laboratory Animals | April 24 |
| World Tapir Day [48] [49] [50] | April 27 |
| International Hyena Day [51] [52] | April 27 |
| Day of Remembrance for all Victims of Chemical Warfare | April 29 |
| Green Up Day | First Saturday of May in Vermont |
| World Tuna Day [53] [54] [55] | May 2 |
| International Leopard Day [56] [57] [58] | May 3 |
| Wild Koala Day [59] [60] | May 3 |
| Greenery Day | May 4 in Japan (previously April 29) |
| World Donkey Day [61] | May 8 |
| Go Public Gardens Days [62] | Friday before to the Sunday after Mother's Day |
| World Migratory Bird Day [63] | Second Saturday of May. Second Saturday of May in the U.S. and Canada; Second Saturday of October in Mexico, Central and South America, and the Caribbean. |
| World Binturong Day [64] | Second Saturday of May. |
| Endangered Species Day [65] | Third Friday of May |
| Bike-to-Work Day | Third Friday of May |
| World Bee Day | May 20 |
| International Day for Biological Diversity (World Biodiversity Day) | May 22 |
| World Turtle Day | May 23 |
| European Day of Parks – Europarc Federation [66] | May 24 |
| World Otter Day [67] | last Wednesday of May |
| World Dugong Day [68] [69] | May 28 |
| Black Birders Week | May 29 |
| World No Tobacco Day | May 31 |
| World Parrot Day [70] [71] [72] | May 31 |
| World Reef Day [73] [74] | June 1 |
| World Peatlands Day | June 2 |
| World Bicycle Day [75] | June 3 |
| World Environment Day | June 5 |
| Solomon Memorial Day | June 5 |
| World Oceans Day | June 8 |
| Coral Triangle Day | June 9 |
| International Lynx Day [76] [77] | June 11 |
| National Cougar Day [78] | June 12 |
| Global Wind Day | June 15 |
| World Sea Turtle Day [79] | June 16 |
| World Day to Combat Desertification and Drought | June 17 |
| World Croc Day [80] | June 17 |
| World Horseshoe Crab Day [81] [82] | June 20 |
| World Giraffe Day | June 21 |
| World Camel Day [83] [84] [85] | June 22 |
| World Rainforest Day [86] [87] | June 22 |
| Black Birders Week [88] | June 24 |
| World Decarbonisation Day | June 25 |
| World Population Day | July 11 |
| Shark Awareness Day [89] [90] [91] [92] | July 14 |
| World Chimpanzee Day [93] [94] [95] | July 14 |
| World Orca Day [96] | July 14 |
| World Snake Day [97] | July 16 |
| Earth Overshoot Day | Advanced to July 24 in 2025 [98] |
| International Day for the Conservation of the Mangrove Ecosystems | July 26 |
| World Nature Conservation Day [99] [100] [101] | July 28 |
| International Tiger Day | July 29 |
| World Ranger Day – International Ranger Federation | July 31 |
| International Clouded Leopard Day [102] | August 4 |
| World Tomistoma Day | August 5 |
| International Moon Bear Day | August 8 |
| World Lion Day [103] | August 10 |
| World Elephant Day | August 12 |
| World Hirola Day [104] | August 12 |
| International Wolf Day [105] [106] | August 13 |
| National Honey Bee Day (US only) | August 15 |
| Scimitar-Horned Oryx Day [107] [108] | August 16 |
| World Orangutan Day [109] | August 19 |
| World Mosquito Day | August 20 |
| World African Wild Dog Day [110] | August 26 |
| International Whale Shark Day [111] [112] | August 30 |
| World Beach Day, aka National Beach Day [113] | September 1 |
| International Primate Day [114] | September 1 |
| Japan Dolphin Day [115] [116] | September 1 |
| Amazon Rainforest Day [117] | September 5 |
| International Vulture Awareness Day [118] [119] [120] | First Saturday of September |
| International Day of Clean Air for blue skies | September 7 |
| World Dolphin Day [121] | September 12 |
| International Colugo Day [122] | September 15 |
| International Day for the Preservation of the Ozone Layer | September 16 |
| World Manta Day [123] | September 17 |
| World Water Monitoring Day | September 18 |
| PARK(ing) Day [ de ] [124] [125] [126] | Third Friday in September |
| World Cleanup Day [127] | September 16, 2023, Third Saturday in September |
| National Cleanup Day [128] | September 18, 2021, Third Saturday in September |
| International Red Panda Day [129] | Third Saturday of September |
| Zero Emissions Day [130] | September 21 |
| Car Free Day | September 22 |
| World Rhino Day [131] | September 22 |
| World Gorilla Day [132] [133] [134] | September 24 |
| World Environmental Health Day [135] | September 26 since 2011 (IFEH) [136] |
| World Cassowary Day [137] [138] | September 26 |
| International Day of Awareness of Food Loss and Waste [139] | September 29 |
| World Rivers Day [140] | Last Sunday of September |
| Australian Wildlife Week [141] | First Week of October |
| International Raccoon Appreciation Day [142] | October 1 |
| World Farm Animals Day [143] | October 2 |
| World Habitat Day | First Monday of October |
| World Animal Day | October 4 |
| National Badger Day [144] [145] [146] | October 6 |
| World Octopus Day [147] [148] [149] | October 8 |
| Energy Efficiency Day [150] | First Wednesday in October |
| International Day for Natural Disaster Reduction | October 13 |
| International E-Waste Day [151] [152] [153] | October 14 |
| International Sawfish Day [154] | October 17 |
| Stepping Stone Day [155] | October 17 |
| Sustainability Day! [156] | Fourth Wednesday of October |
| World Okapi Day [157] [158] | October 18 |
| International Sloth Day [159] [160] [161] | October 20 |
| National Reptile Awareness Day [162] [163] | October 21 |
| World Earthworn Day [164] [165] | October 21 |
| International Wombat Day [166] [167] [168] | October 22 |
| International Snow Leopard Day [169] [170] | October 23 |
| Freshwater Dolphin Day [171] | October 24 |
| International Gibbon Day [172] [173] [174] | October 24 |
| International Day of Climate Action | October 24 |
| World Lemur Day [175] [176] | Last Friday of October |
| World Ecology Day [177] | November 1 |
| World Vegan Day | November 1 |
| World Basking Shark Day | November 3 |
| International Day for Preventing the Exploitation of the Environment in War and Armed Conflict | November 6 |
| National Bison Day | First Saturday in November |
| America Recycles Day | November 15 |
| World Fisheries Day [178] | November 21 |
| International Jaguar Day [179] [180] | November 29 |
| International Cheetah Day [181] [182] | December 4 |
| Wildlife Conservation Day [183] | December 4 |
| World Soil Day [184] | December 5 |
| International Mountain Day | December 11 |
| Monkey Day | December 14 |
| Ozone Action Day | Variable date depending weather conditions |
| eDay – Electronic Waste Day | Variable date, in New Zealand |
| World Fish Migration Day | Variable date (next one- 22 May 2022; last one- 24 October 2020) |