The following is the list of governors of Corpus separatum (Fiume) and heads of state of the Free State of Fiume:
| Tenure | Incumbent | Notes |
|---|---|---|
| Hungarian Suzerainty | ||
| 20 October 1776 to 1783 | József gróf Majláth Székhélyi, Governor | |
| 1783 to 1788 | Pál gróf Almásy Zsadányi, Governor | |
| 1788 to 1791 | János Pétar gróf Szápáry, Governor | |
| Illyrian Provinces | ||
| July 1809 to November 1809 | Marc Bryd (Marco de Bryde), Provisory Intendant of Fiume | |
| November 1809 to 1810 | François-Casimir Du Val de Chassenon de Curzay, Intendant of Fiume | |
| 1810 to 1811 | Marie Méry de Contades, Intendant of Fiume | |
| Hungarian Suzerainty | ||
| 1822 to 1823 | György Majláth, Governor | |
| 1823 to 1837 | Ferenc Ürményi, Governor | |
| 1837 to 1847 | Pál Kiss de Nemeskéri, Governor | |
| 1847 to 1848 | János gróf Erdödy, Governor | |
| Croatian Suzerainty | ||
| 1848 to 1851 | Josip Bunjevac, Banal commissioner | |
| 1851 to 1852 | Josip Graf Rusnov, Banal commissioner | |
| 1852 to 1856 | Herbert von Kellersperg, High Sheriff | |
| 1856 to 1862 | Karl Graf von Hohenwart-Gerlachstein, High Sheriff | |
| 1862 to 1866 | Herman Freiherr von Sterneck, Royal commissioner | |
| Hungarian Suzerainty | ||
| 6 April 1867 to 29 July 1870 | Ede Cseh de Szentkatolna, Royal commissioner | |
| 29 July 1870 to 5 December 1872 | József gróf Zichy de Zich et Vásonkeö, Governor | |
| 26 February 1873 to 1 November 1883 | Géza gróf Szapáry de Szapár, Governor | |
| 1 November 1883 to 6 March 1892 | Ágost gróf Zichy, Governor | |
| 6 March 1892 to 2 October 1896 | Lajos gróf Batthyány de Nemetujvár, Governor | |
| 2 October 1896 to 14 July 1897 | Rezsö báró Abele de Lilienberg, Governor | |
| 14 July 1897 to 23 November 1897 | Tibor Gaal de Hatvan, acting Governor | 1st Term |
| 23 November 1897 to 2 August 1903 | László gróf Szapáry de Szapár, Governor | |
| 2 August 1903 to 10 December 1903 | Tibor Gaal de Hatvan, acting Governor | 2nd Term |
| 10 December 1903 to 17 February 1905 | Ervin báró Roszner, Governor | |
| 17 February 1905 to 17 October 1905 | Tibor Gaal de Hatvan, acting Governor | 3rd Term |
| 17 October 1905 to 26 December 1905 | Pál gróf Szapáry de Szapár, Governor | |
| 26 December 1905 to 24 May 1906 | Tibor Gaal de Hatvan, acting Governor | 4th Term |
| 4 April 1906 to 29 April 1906 | György gróf Károlyi de Nagykároly, Governor | |
| 24 May 1906 to 7 December 1909 | Sándor gróf Nákó de Nagyszentmiklós, Governor | |
| 7 December 1909 to 13 November 1910 | István gróf Wickenburg de Capelló, acting Governor | |
| 13 November 1910 to 31 July 1917 | István gróf Wickenburg de Capelló, Governor | |
| 31 July 1917 to 28 October 1918 | Zoltán Jekelfalussy de Jekel- és Margitfalva, Governor | |
| Under the Principal Allied and Associated Powers | ||
| 28 October 1918 to 29 October 1918 | Zoltán Jekelfalussy de Jekel- és Margitfalva, Governor | |
| 29 October 1918 to 17 November 1918 | Rikard Lenac, High Sheriff | |
| Italian/Allied Suzerainty | ||
| 17 November 1918 to 8 September 1920 | Antonio Grossich, President of the Italian National Council of Fiume | |
| 14 September 1919 to 8 September 1920 | Gabriele D'Annunzio, Commander | |
| Italian Regency of Carnaro | ||
| 8 September 1920 to 29 December 1920 | Gabriele D'Annunzio, First Chancellor | |
| 29 December 1920 to 31 December 1920 | Riccardo Gigante, President of the Municipal Council of Fiume | |
| Free State of Fiume | ||
| 31 December 1920 to 27 April 1921 | Antonio Grossich, Chairman of the Provisional Government of the State | |
| 27 April 1921 to 28 April 1921 | Riccardo Gigante, President of the Provisional Directory of Fiume | |
| 28 April 1921 to 13 June 1921 | Salvatore Bellasich, Commissioner Extraordinary | |
| 13 June 1921 to 1921 | Antonio Foschini, High commissioner | Appointed on behalf of Kingdom of Italy |
| 1921 to 5 October 1921 | Luigi Amantea, High commissioner | Appointed on behalf of Kingdom of Italy |
| 5 October 1921 to 4 March 1922 | Riccardo Zanella, President | |
| 4 March 1922 to 9 March 1922 | Committee of National Defense | |
| 9 March 1922 to 16 March 1922 | Giovanni Giuriati, provisional President | |
| 17 March 1922 to 17 September 1923 | Attilio Depoli, Provisional Head of State | |
| 17 September 1923 to 16 March 1924 | Gaetano Giardino, Military Governor | Appointed on behalf of Kingdom of Italy |
| 16 March 1924 | Incorporated into Kingdom of Italy | |