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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1918 | 1 december | Kingdom - dinasty Karageorgevic | king Petar I king of Serbia | Nikola Pasic (I) |
| 1918 | 22 december | Stojan Protic (I) | ||
| 1919 | 16 august | Ljubomir Davidovic (I) | ||
| 1920 | 19 february | Stojan Protic (II) | ||
| 1920 | 16 may | Milenko Vesnic | ||
| 1921 | 1 january | Nikola Pasic (II) | ||
| 1921 | 16 august | king Aleksandar II | ||
| 1924 | 28 july | Ljubomir Davidovic (II) | ||
| 1924 | 6 november | Nikola Pasic (III) | ||
| 1926 | 8 april | Nikola Uzunovic (I) | ||
| 1927 | 17 april | Velimir Vukicevic | ||
| 1928 | 28 july | Antun Korosec | ||
| 1929 | 6 january | Petar Zivkovic | ||
| 1932 | 4 april | Vojislav Marinkovic | ||
| 1932 | 3 july | Milan Srskic | ||
| 1934 | 27 january | Nikola Uzunovic (II) | ||
| 1934 | 9 october | king Petar II | ||
| 1934 | 22 december | Bogoljub Jevtic | ||
| 1935 | 24 june | Milan Stojadinovic | ||
| 1939 | 5 february | Dragisa Cvetkovic | ||
| 1941 | 27 march | Dusan T. Simovic |
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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1941 | 6 april | German and Italian Occupation | ||
| 1943 | 8 september | German Occupation | ||
| 1945 | 29 january | Kingdom - dinasty Karageorgevic | king Petar II | Drago Marusic |
| 1945 | 7 march | Josip Broz Tito |
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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1945 | 29 november | Federal Popular Republic | Ivan Ribar | Josip Broz Tito |
| 1953 | 14 january | Josip Broz Tito | ||
| 1963 | 29 june | Federal Socialist Republic | Petar Stambolic | |
| 1967 | 16 may | Mika Spiljak | ||
| 1969 | 18 may | Mitja Ribicic | ||
| 1971 | 30 july | Dzemal Bijedic | ||
| 1977 | 15 march | Veselin Djuranovic | ||
| 1980 | 4 may | Lazar Kolisevski | ||
| 1980 | 15 may | Cvijetin Mijatovic | ||
| 1981 | 15 may | Sergej Kraigher | ||
| 1982 | 16 may | Petar Stambolic | Milka Planinc | |
| 1983 | 13 may | Mika Spiljak | ||
| 1984 | 15 may | Veselin Djuranovic | ||
| 1985 | 15 may | Radovan Vlajkovic | ||
| 1986 | 15 may | Sinan Hasani | Branko Mikulic | |
| 1987 | 15 may | Lazar Mojsov | ||
| 1988 | 15 may | Raif Dizdarevic | ||
| 1989 | 16 march | Ante Markovic | ||
| 1989 | 15 may | Janez Drnovsek | ||
| 1990 | 15 may | Borisav Jovic | ||
| 1991 | 16 may | Stjepan-Stipe Mesic | ||
| 1991 | 3 october | Branko Kostic | ||
| 1991 | 20 december | Aleksandar Mitrovic |
| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1992 | 15 june | Federal Republic of Serbia and Montenegro | Dobrica Cosic | Milan Panic |
| 1993 | 9 february | Radoje Kontic | ||
| 1993 | 1 june | Milos Radulovic | ||
| 1993 | 25 june | Zoran Lilic | ||
| 1997 | 25 june | Srdja Bozovic | ||
| 1997 | 23 july | Slobodan Milosevic | ||
| 1998 | 19 may | Momir Bulatovic | ||
| 2000 | 7 october | Vojislav Kostunica | ||
| 2000 | 4 november | Zoran Zizic | ||
| 2001 | 24 july | Dragisa Pesic | ||
| 2003 | 7 march | Svetozar Marovic | ||
| 2003 | 17 march | - | ||
| 2006 | 5 june | End of Union |