| Memorial of Slovak mathematicians — May | |
| 4. 5. 1994 | Ján Futák , died. |
| 4. 5. 1933 | Štefan Iľaš , was born. |
| 4. 5. 1905 | Ján Stalmašek , was born. |
| 5. 5. 1855 | Michal Demeczky , was born. |
| 6. 5. 1998 | Vladimír Piják , died. |
| 8. 5. 1916 | Augustín Scholtz , died. |
| 9. 5. 1810 | Johann Hönig , was born. |
| 10. 5. 1899 | Otakar Borůvka , was born. |
| 11. 5. 1820 | Eduard Pöschl , was born. |
| 11. 5. 1947 | Štefan Šujan , was born. |
| 12. 5. 1952 | Ľudovít Romsauer , died. |
| 12. 5. 1954 | Peter Uhlík , died. |
| 15. 5. 1720 | Maximilián Hell , was born. |
| 16. 5. 1977 | Vít Hejný , died. |
| 17. 5. 1881 | Jur Hronec , was born. |
| 18. 5. 1914 | Štefan Schwarz , was born. |
| 19. 5. 1714 | Alexius Cörver , was born. |
| 19. 5. 1910 | Eduard Haluška , was born. |
| 20. 5. 1982 | Jozef Filip , died. |
| 22. 5. 1895 | Josef Kaucký , was born. |
| 22. 5. 1996 | Ján Ninčák , died. |
| 29. 5. 1884 | Karel Dusl , was born. |
| 31. 5. 1823 | Martin Čulen , was born. |
| 31. 5. 1909 | Alois Šmíd , was born. |
