Counts, dukes and grand dukes of Oldenburg
[image:BlasonChristian Ier (1143-1167), comte d'Oldenbourg.svg|right|120px|thumb|Shield of the Counts of Oldenburg]
[image:Blason Gérard VI (1430-1500), comte d'Oldenbourg et de Delmenhorst.svg|120px|thumb|right|Shield of the Counts of Oldenburg-Delmenhorst]
This is a list of the counts, dukes, grand dukes, and prime ministers of Oldenburg.
Counts of Oldenburg
- 1088/1101–1108 Elimar I
- 1108–1143 Elimar II
- 1143–1168 Christian I the Quarrelsome
- 1168–1211 Maurice I
- 1209–1251 Otto I, joint rule with Christian II and later with John I
- 1211–1233 Christian II
- 1233–1272 John I
- 1272–1278 Christian III
- 1272–1301 Otto II, Count of Oldenburg-Delmenhorst
- 1278–1305 John II
- 1302–1323 Christian IV
- 1305–1345 John III
- 1331–1356 John IV
- 1345–1347 Conrad I
- 1368–1386 Conrad II
- 1386–1420 Maurice II
- 1368–1398 Christian V
- 1398–1423 Christian VI
- 1423–1440 Dietrich the Lucky
- 1440–1448 Christian VII
- 1448–1483 Gerhard VI "the Quarrelsome"
- 1483–1500 Adolph, Count of Oldenburg-Delmenhorst
- 1500–1526 John V
- 1526–1529 John VI, joint rule with his brothers George, Christopher and Anthony I, forced to resign in 1529
- 1526–1529 George, joint rule with his brothers John VI, Christopher and Anthony I, forced to resign in 1529
- 1526–1566 Christopher, joint rule with his brothers John VI, George and Anthony I
- 1526–1573 Anthony I, joint rule with his brothers John VI, George and Christopher
- 1573–1603 John VII
- 1573–1619 Anthony II, Count of Oldenburg-Delmenhorst
- 1603–1667 Anthony Günther
- 1667–1670 Frederick I, in personal union as Frederick III King of Denmark-Norway
- 1670–1699 Christian VIII, in personal union as Christian V King of Denmark-Norway
- 1699–1730 Frederick II, in personal union as Frederick IV King of Denmark-Norway
- 1730–1746 Christian IX, in personal union as Christian VI King of Denmark-Norway
- 1746–1766 Frederick III, in personal union as Frederick V King of Denmark-Norway
- 1766–1773 Christian X, in personal union as Christian VII King of Denmark-Norway, ceded the county to the Holstein-Gottorp line
- 1773 Paul I, ceded the county to his cousin of the Holstein-Gottorp line
- 1773–1774 Frederick Augustus I, in personal union Prince-Bishop of Lübeck
Full style
- ''Grand Duke of Oldenburg, Heir in Norway, Duke of Schleswig, Holstein, Stormarn, Ditmarshes & Oldenburg, Prince of Lübeck and Birkenfeld, Lord of Jever and Kniphausen''
Prime ministers of the Republic of Oldenburg
- 1918–1919 Bernhard Kuhnt
- 1919–1923 Theodor Tantzen
- 1923–1930 Eugen von Finckh
- 1930–1932 Friedrich Cassebohm
- 1932–1933 Carl Röver
- 1933–1945 Georg Joel
- 1945–1946 Theodor Tantzen