Duchy of Guastalla Duchêt ed Guastâla (Emilian) | |||||||||
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| 1621–1748 | |||||||||
 Coat of arms
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 The Duchy of Guastalla in 1700. | |||||||||
| Status | Duchy | ||||||||
| Capital | Guastalla | ||||||||
| Common languages | Emilian | ||||||||
| Religion | Roman Catholicism | ||||||||
| Duke | |||||||||
• 1621–1630 | Ferrante II Gonzaga (first) | ||||||||
• 1729–1746 | Giuseppe Gonzaga (last) | ||||||||
| History | |||||||||
| 2 July 1621 | |||||||||
| 18 October 1748 | |||||||||
| Currency | Guastalla lira | ||||||||
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| Today part of | Italy | ||||||||
The Duchy of Guastalla (Italian: Ducato di Guastalla) was an Italian state which existed between 1621 and 1748. It was bordered by the Duchy of Modena and Reggio and the Po River to the north, on the opposite bank of the Duchy of Mantua.