Following are the important days in May month common across both India as well as other countries. This list provides insights on the occurrence of important events in the month of May.
| 1st May | International Labour Day |
| 1st May | Gujarat Day |
| 1st May | Maharashtra Day |
| 2nd May | World Laughter Day |
| 2nd May | World Tuna Day |
| 3rd May | Press Freedom Day |
| 4th May | Coal Miner’s Day |
| 7th May | Rabindranath Tagore Jayanthi |
| 7th May | World Athletics Day |
| 7th May | World Asthma Day |
| 8th May | World Red Cross Day |
| 8th May | World Thalassemia Day |
| 11th May | National Technology Day |
| 11th May | World Migratory Bird Day |
| 12th May | International Nurses Day |
| 15th May | International Day of Families |
| 17th May | World Hypertension Day |
| 17th May | National Endangered Species Day |
| 17th May | World Telecommunication Day |
| 18th May | World AIDS Vaccine Day |
| 21st May | National Anti-Terrorism Day |
| 22nd May | International Day for Biological Diversity |
| 23rd May | Buddha Purnima |
| 29th May | International Day of UN Peacekeepers |
| 31st May | World No-Tobacco Day |
