The following is a list of governors of the Province of Trieste, from 1918 to 1954. It includes Italian military governor, general civil commissioners and prefects, as well as Allied/Yugoslav military governors of the Free Territory of Trieste (Governors of all Julian March prior to the establishment of the Territory) in the aftermath of World War II.
| Tenure | Incumbent | Notes | width=50px | Portrait |
|---|---|---|---|---|
| Italian suzerainty | ||||
| Carlo Petitti di Roreto, | ||||
| , | ||||
| Antonio Mosconi, | ||||
| , | ||||
| Amadeo Moroni, | ||||
| Giovanni Gasti, | ||||
| Bruno Fornaciari, | ||||
| , | ||||
| Carlo Tiengo, | ||||
| , | ||||
| Dino Borri, | ||||
| Tullio Tamburini, | ||||
| Giuseppe Cocuzza, | ||||
| German occupation | ||||
| Tullio Tamburini, | ||||
| Bruno Coceani, | ||||
| Antonio De Berti, | ||||
| Free Territory | ||||
| Zone A (Allied) | ||||
| Bernard Freyberg, | ||||
| Alfred Connor Bowman, | ||||
| James Jewett Carnes, | ||||
| Sir Terence Airey, | ||||
| Sir John Winterton, | ||||
| Zone B (Yugoslav) | ||||
| Dušan Kveder, | ||||
| Mirko Lenac, | ||||
| Miloš Stamatović, | ||||