Important Dates and Days of May 2023
| Important Day | Date/Month | Theme for 2023 | Remark |
| International Labour Day | 1st May | Labour Day was celebrated for the first time in India in 1923. | |
| Ujjwala Diwas | 1st May | ||
| World Tuna Day | 2nd May | ||
| World Asthma Day | First Tuesday of May (2nd May 2023) | Asthma care for all | |
| World Press Freedom Day | 3rd May | Shaping a Future of Rights: Freedom of expression as a driver for all other human rights | |
| International Leopard Day | 3rd Day | ||
| Coal Miners Day | 4th May | ||
| International Firefighters’ Day | 4th May | ||
| World Hand Hygiene Day | 5th May | ||
| World Portuguese Language Day | 5th May | ||
| World Cartoonist’s Day | 5th May | ||
| African World Heritage Day | 5th May | ||
| International Day of Midwife | 5th May | Together again: from evidence to reality | |
| International No Diet Day | 6th May | ||
| World Laughter Day | First Sunday of May (7th May 2023) | The day was first observed in Mumbai in 1998. | |
| World Red Cross and Red Crescent Day | 8th May | Everything we do comes #from the heart’ | |
| World Thalassemia Day | 8th May | Be Aware. Share. Care: Strengthening Education to Bridge the Thalassaemia Care Gap | |
| International Day of Argania | 10th May | Socio-economic development & sustainability of the Argan ecosystem | |
| World Lupus Day | 10th May | Make Lupus Visible | |
| National Technology Day | 11th May | School to Startups- Igniting Young Minds to Innovate | |
| International Day of Plant Health | 12th May | Plant Health for Environmental Protection | |
| International Nurses Day | 12th May | Our Nurses. Our Future | |
| International Nurses Week | 6th to 12th May | ||
| World Migratory Bird Day | 13th May | Water: Sustaining Bird Life | |
| International Day of Families | 15th May | Demographic Trends and Families | |
| International Day of Living Together in Peace | 16th May | ||
| International Day of Light | 16th May | ||
| National Dengue Day | 16th May | ||
| World Telecommunication and Information Society Day | 17th May | Empowering the least developed countries through information and communication technologies | |
| World Hypertension Day | 17th May | Measure Your Blood Pressure Accurately, Control It, Live Longer | |
| International Day Against Homophobia, Transphobia, and Biphobia | 17th May | Together Always: United in Diversity | |
| International Museum Day | 18th May | Museums, Sustainability and Wellbeing | |
| World AIDS Vaccine Day | 18th May | ||
| World Inflammatory Bowel Disease Day (IBD) | 19th May | ||
| National Endangered Species Day | Third Friday of May | ||
| (19th May 2023) | |||
| World Bee Day | 20th May | Bee engaged in pollinator-friendly agricultural production | |
| World Metrology Day | 20th May | Measurements supporting the global food system | |
| World Day for Cultural Diversity for Dialogue and Development | 21st May | ||
| Anti-Terrorism Day | 21st May | ||
| International Tea Day | 21st May | ||
| Global Road Safety Week | 15th to 21st May | Streets for Life #RethinkMobility | |
| International Day for Biological Diversity | 22nd May | From agreement to action: Build back biodiversity | |
| International Olympic Day | 23rd June | Let’s Move | |
| United Nations Public Service Day | 23rd June | Innovative Public Service Delivery: Ensuring No One Is Left Behind | |
| International Widows’ Day | 23rd June | The day was first observed in 2011. | |
| Day of the Seafarer (DotS) | 25th June | MARPOL at 50 – Our commitment goes on | |
| World Vitiliigo Day | 25th June | Vitiligo: Looking into the Future | Purple is the official colour representing the Vitiligo, a skin disease. |
| International Day in Support of Victims of Torture | 26th June | ||
| World Drug Day | 26th June | People first: stop stigma and discrimination, strengthen prevention | |
| World Refrigeration Day | 26th June | Next Generation Cooling: The Future is in our hands | |
| World Micro-, Small and Medium-sized Enterprises (MSME) Day | 27th June | ||
| National Insurance Awareness Day | 28th June | ||
| World Allergy Awareness Week | 18th to 24th June 2023 | Managing allergic diseases amidst climate change | The week was first observed in 2011. |
| National Statistics Day | 29th June | Alignment of State Indicator Framework with National Indicator Framework for Monitoring Sustainable Development Goals | |
| International Day of the Tropics | 29th June | The day was first observed in 2017. | |
| International Asteroid Day | 30th June | The day was first observed in 2017. | |
| International Day of Parliamentarism | 30th June | Parliaments for the Planet |
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