| 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 |
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