| Franz Joseph I | |
| Duke of Troppau and Jägerndorf | |
| Succession: | Prince of Liechtenstein |
| Reign: | 10 February 1772 – 18 August 1781 |
| Predecessor: | Josef Wenzel I |
| Successor: | Aloys I |
| Birth Place: | Milan, Duchy of Milan |
| Death Place: | Metz, France |
| Burial Place: | Church of the Nativity of the Virgin Mary, Brno |
| Spouse: | Leopoldine von Sternberg |
| Issue: | Aloys I, Prince of Liechtenstein Johann I Joseph, Prince of Liechtenstein Maria Josepha Hermengilde Esterházy |
| Full Name: | Franz de Paula Josef Johann Nepomuk Andreas |
| House: | Liechtenstein |
| Father: | Prince Emanuel of Liechtenstein |
| Mother: | Countess Anna Antonia of Dietrichstein-Weichselstädt |
| Religion: | Roman Catholic |
Franz Joseph I, Prince of Liechtenstein, born Franz de Paula Josef Johann Nepomuk Andreas (19 November 1726 – 18 August 1781), was the Prince of Liechtenstein from 1772 until his death.[1]
Born in Milan, in what is now northern Italy, he was the son of Prince Emanuel of Liechtenstein and Maria Anna Antonia, Countess of Dietrichstein-Weichselstädt, Baroness zu Hollenburg und Finkenstein (10 September 1706 – 7 June 1777). Franz Josef was the eldest of their thirteen children. He was a nephew of Joseph Wenzel I, whom he succeeded on 10 February 1772.
Franz Joseph had been recognised heir to Liechtenstein since 1723, when his uncle's only son had died. Joseph Wenzel took Franz Joseph under his wing and Franz Joseph accompanied him in a campaign in Northern Italy, fighting with Wenzel at the Battle of Piacenza. The battle was a victory for the Holy Roman Empire, of which Liechtenstein was a part.
He was the 802nd Knight of the Order of the Golden Fleece in Austria.
In 1763, Franz Josef traveled on behalf of the Emperor to Spain, to bring the bride of Archduke Leopold a picture of the Archduke. In 1767, he became Privy Councillor, and in 1771, he received the Order of the Golden Fleece.
His last public role was to act as president of the Lower Austrian Nobility in 1778.
Once Franz Joseph became Prince of Liechtenstein, he showed great interest in its economic problems and the ever-increasing Liechtenstein art collection. He died in Metz in 1781.
Franz Josef married Marie Leopoldine Gräfin von Sternberg (Vienna, 11 December 1733 – Feldsberg, 27 June 1809), a member of the Bohemian nobility, on 6 July 1750 in Valtice or Feldsberg. The couple had 8 children: