| January | Cause Day |
| 17 January | World Religion Day — #WorldReligionDay |
| 18 January | Martin Luther King, Jr. Day of Service — #MLKDay |
| February | |
| 2 February | World Wetlands Day — #WorldWetlandsDay |
| 4 February | World Cancer Day — #WorldCancerDay |
| 13 February | World Radio Day — #WorldRadioDay |
| 13 February | World Whale Day — #WorldWhaleDay |
| 14 February: | V-Day — #1BillionRising |
| 17 February: | Digital Learning Day — #DLDay |
| 20 February: | World Day of Social Justice — #SocialJusticeDay |
| 23 February: | World Spay Day — #WorldSpayDay |
| 27 February: | International Polar Bear Day — #PolarBearDay |
| 29 February | Rare Disease Day — #RareDiseaseDay |
| March | |
3 March : | World Wildlife Day — #WorldWildlifeDay |
| 8 March : | International Women’s Day — #WomensDay |
| 10 March : | World Kidney Day — #WorldKidneyDay |
| 19 March : | Earth Hour — #EarthHour |
| 21 March : | International Day for the Elimination of Racial Discrimination — #EndRacism |
| 21 March : | International Day of Forests — #ForestsDay |
| 21 March : | World Down Syndrome Day — #DownSyndromeDay |
| 21 March: | World Poetry Day — #WorldPoetryDay |
| 22 March: | World Water Day — #WorldWaterDay |
| 24 March: | World Tuberculosis Day — #WorldTBDay |
| April | |
2 April : | World Autism Awareness Day — #WorldAustismDay |
| 7 April : | World Health Day — #WorldHealthDay |
| 12 April : | International Day for Street Children — #StreetChildrenDay |
| 15 April : | World Art Day — #WorldArtDay |
| 16 April : | World Dolphin Day — #DolphinDay |
| 22 April : | Earth Day — #EarthDay |
| 23 April : | World Book Day — #WorldBookDay |
| 25 April : | World Malaria Day — #WorldMalariaDay |
| 25 April : | World Penguin Day — #WorldPenguinDay |
| 30 April : | International Jazz Day — #JazzDay |
| May | |
| 1 May : | International Workers’ Day — #LaborDay |
| 3 May : | World Press Freedom Day — #WorldPressFreedomDay |
| 3 May : | Give Local America Day — #GiveLocal16 |
| 7 May: | World Migratory Bird Day — #WorldMigratoryBirdDay |
| 10 May : | World Lupus Day — #WorldLupusDay |
| 14 May : | World Fair Trade Day — #FairTradeDay |
| 17 May : | International Day Against Homophobia, Transphobia, and Biphobia — #IDAHOT |
| 18 May : | International Museum Day — #MuseumDay |
| 22 May : | International Day for Biological Diversity — #BiologicalDiversityDay |
| 23 May: | World Turtle Day — #WorldTurtleDay |
| 31 May : | World No Tobacco Day — #WorldNoTobaccoDay |
| June | |
| 5 June : | World Environment Day — #WorldEnvironmentDay |
| 8 June : | World Oceans Day — #WorldOceansDay |
| 12 June : | World Day Against Child Labor — #WDACL |
| 20 June : | World Refugee Day — #WorldRefugeeDay |
| 21 June : | International Day of Yoga — #YogaDay |
| July | |
| 11 July : | World Population Day — #WorldPopulationDay |
| 18 July : | Nelson Mandela International Day — #MandelaDay |
| 28 July : | World Hepatitis Day — #WorldHepatitisDay |
| 29 July : | International Tiger Day — #TigerDay |
| 30 July : | World Day Against Trafficking in Persons — #WorldDayAgainstTrafficking |
| August | |
| 8 August : | International Cat Day — #CatDay |
| 9 August : | International Day of the World’s Indigenous Peoples — #IndigenousDay |
| 12 August : | International Youth Day — #YouthDay |
| 12 August : | World Elephant Day — #WorldElephantDay |
| 19 August : | World Humanitarian Day — #WorldHumanitarianDay |
| 26 August : | International Dog Day — #DogDay |
| 29 August : | International Day Against Nuclear Tests — #AgainstNuclearTestsDay |
| September | |
| 5 September : | International Day of Charity — #CharityDay |
| 8 September : | International Literacy Day — #LiteracyDay |
| 10 September : | World Suicide Prevention Day — #WSPD |
| 15 September : | International Day of Democracy — #DemocracyDay |
| 21 September : | International Day of Peace — #PeaceDay |
| 22 September : | World Rhino Day — #WorldRhinoDay |
| 25 September : | World Rivers Day — #WorldRiversDay |
| 27 September : | World Tourism Day — #WorldTourismDay |
| October | |
| 4 October : | World Animal Day — #WorldAnimalDay |
| 5 October : | World Cerebral Palsy Day — #WorldCPDay |
| 5 October : | World Habitat Day — #WorldHabitatDay |
| 5 October : | World Teachers Day — #WorldTeachersDay |
| 10 October : | World Mental Health Day — #WorldMentalHealthDay |
| 11 October : | International Day of the Girl — #DayOfTheGirl |
| 12 October : | World Arthritis Day — #WorldArthritisDay |
| 15 October: | International Day of Rural Women — #RuralWomenDay |
| 16 October : | World Food Day — #WorldFoodDay |
| 17 October: | International Day for the Eradication of Poverty —#EndPoveryDay |
| 29 October: | World Internet Day — #WorldInternetDay |
| 31 October: | World Cities Day — #WorldCitiesDay |
| November | |
| 13 November : | World Kindness Day — #WorldKindnessDay |
| 14 November : | World Diabetes Day — #WorldDiabetesDay |
| 16 November : | International Day for Tolerance — #ToleranceDay |
| 19 November : | World Philosophy Day — #WorldPhilosophyDay |
| 19 November : | World Toilet Day — #WorldToiletDay |
| 20 November : | Universal Children’s Day — #ChildrensDay |
| 21 November : | World Television Day — #WorldTVDay |
| 25 November : | International Day for the Elimination of Violence Against Women —#EndViolenceAgainstWomen |
| 29 November : | Giving Tuesday — #GivingTuesday |
| December | |
| 1 December : | World AIDS Day — #WorldAIDSDay |
| 3 December : | International Day of People with Disabilities — #IDPwD |
| 5 December : | International Volunteer Day — #VolunteerDay |
| 5 December : | World Soil Day — #WorldSoilDay |
| 9 December : | International Anti-Corruption Day — #AntiCorruptionDay |
| 10 December : | International Human Rights Day — #HumanRightsDay |
| 11 December : | International Mountain Day — #MountainDay |
| 18 December : | International Migrants Day — #MigrantsDay |