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Sister republics (, ) were established by the French First Republic or local pro-French revolutionaries during the French Revolutionary Wars. Though nominally independent, sister republics were heavily reliant on French protection, making them in effect of France. This became particularly evident after the First French Empire was established in 1804, after which France annexed several sister republics and transformed the remainder into monarchies ruled by members of the House of Bonaparte.
| Subalpine Republic | 1800–1802 | Piedmont | Annexed by the French Republic. | |
| Piedmontese Republic | 1798–1799 | Piedmont | Predecessor to the Subalpine Republic. Conquered by Austro-Russian troops, later reconquered by Napoleon. | |
| Republic of Alba | 1796 | Alba | Predecessor to the Piedmontese Republic; reconquered by the Kingdom of Sardinia. | |
| Parthenopean Republic | 1799 | Naples | Reconquered by the Sanfedismo for the King of Naples and Sicily. | |
| Republic of Pescara | 1799 | Pescara | Reunited with the Kingdom of Naples. | |
| Roman Republic | 1798–1799 | Papal States | Ended with the restoration of the Papal States. | |
| Anconine Republic | 1797–1798 | Ancona | Joined the Roman Republic. | |
| Tiberina Republic | 1798–1799 | Perugia | Joined the Roman Republic. | |
| Ligurian Republic | 1797–1805 | Genoa | Annexed by the French Empire. | |
| Republic of Lucca | 1799, 1800–1805 | Lucca | Replaced by the Principality of Lucca and Piombino. | |
| Italian Republic (Napoleonic) | 1802–1805 | Northern Italy | Transformed into the Kingdom of Italy (Napoleonic). | |
| Cisalpine Republic | 1797–1802 | Northern Italy | Transformed into the Italian Republic. | |
| Cispadane Republic | 1796–1797 | Emilia-Romagna | Merged with the Transpadane Republic to form the Cisalpine Republic. | |
| Bolognese Republic | 1796 | Bologna | Annexed by the Cispadane Republic. | |
| Transpadane Republic | 1796–1797 | Lombardy | Merged with the Cispadane Republic to form the Cisalpine Republic. | |
| Republic of Crema | 1797 | Crema | Annexed by the Cisalpine Republic. | |
| Republic of Bergamo | 1797 | Bergamo | Annexed by the Cisalpine Republic. | |
| Republic of Brescia | 1797 | Brescia | Annexed by the Cisalpine Republic. | |
| Provisional Municipality of Venice | 1797–1798 | Venice | Ceded to the Austrian Empire by the Treaty of Campo Formio. | |
| Republic of Bouillon | 1794–1795 | Bouillon (modern-day Belgium) | Annexed by the French First Republic. | |
| Republic of Liège | 1789–1791 | Prince-Bishopric of Liège (modern-day Belgium) | Dissolved after restoration of the Prince-Bishopric; later annexed by France. | |
| Rauracian Republic | 1792–1793 | Basel (modern-day Switzerland) | Annexed by the French First Republic. | |
| Lémanique Republic | 1798 | Vaud (modern-day Switzerland) | Joined the Helvetic Republic as the Canton of Léman. | |
| Republic of Mainz | 1793 | Rhenish Hesse and Palatinate (modern-day Germany) | Collapsed upon the Prussian reconquest of Mainz. | |
| Batavian Republic | 1795–1806 | Netherlands | Replaced by the Kingdom of Holland. | |
| Cisrhenian Republic | 1797 | West bank of the Rhine (modern-day Germany) | Proclaimed but not fully established; area annexed by France. | |
| Irish Republic (1798) | 1798 | Connacht (Ireland) | Proclaimed during the Irish Rebellion of 1798; collapsed with the defeat of the Franco-Irish force. | |
| Helvetic Republic | 1798–1803 | Switzerland | Dissolved by Napoleon's Act of Mediation. | |
| Altamura | 1799 | Altamura (Kingdom of Naples) | Crushed by Neapolitan royalist forces (the Sanfedisti). | |
| Astese Republic | 1797 | Asti | Short-lived, suppressed and absorbed by the Cisalpine Republic. | |
| 1796 | Reggio Emilia | Annexed by the Cispadane Republic. | ||
| Rhodanic Republic | 1802–1810 | Valais (modern-day Switzerland) | Transformed into the Republic of Valais under French influence, later annexed. |
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