| Memorial of Slovak mathematicians — January | |
| 1. 1. 1703 | Ignác Hertl , was born. |
| 1. 1. 1941 | Pavol Šoltés , was born. |
| 2. 1. 1991 | Ondrej Strečko , died. |
| 6. 1. 1807 | Jozef Maximilián Petzval , was born. |
| 6. 1. 1809 | Oto Petzval , was born. |
| 10. 1. 1916 | Karol Henrich Fuchs , died. |
| 10. 1. 1785 | František Weiss , died. |
| 11. 1. 1992 | Vojtech Illenčík , died. |
| 11. 1. 1933 | Jaroslav Krbiľa , was born. |
| 11. 1. 1905 | Bohumil Pokorný , was born. |
| 12. 1. 1914 | Kornélia Kropiláková , was born. |
| 15. 1. 1996 | Ladislav Moravský , died. |
| 19. 1. 1932 | Viliam Ficker , was born. |
| 19. 1. 1985 | Štefan Šujan , died. |
| 24. 1. 1894 | Martin Čulen , died. |
| 24. 1. 1993 | Eva Gedeonová , died. |
| 24. 1. 1992 | Kornélia Kropiláková , died. |
| 24. 1. 1986 | Zdeno Vlachynský , died. |
| 26. 1. 1816 | František Rausch , died. |
| 27. 1. 1931 | Igor Kluvánek , was born. |
| 27. 1. 1981 | Jaroslav Krbiľa , died. |
| 28. 1. 1925 | Mária Jakubíková , was born. |
| 30. 1. 1922 | Ondrej Gábor , was born. |
| 30. 1. 1938 | Miloš Háčik , was born. |
