| Aloys I | |
| Duke of Troppau and Jägerndorf | |
| Succession: | Prince of Liechtenstein |
| Reign: | 18 August 1781 – 24 March 1805 |
| Predecessor: | Franz Joseph I |
| Successor: | Johann I Joseph |
| Spouse: | Karoline von Manderscheid-Blankenheim |
| Full Name: | Aloys Josef Johannes Nepomuk Melchior |
| House: | Liechtenstein |
| Father: | Franz Joseph I, Prince of Liechtenstein |
| Mother: | Leopoldine von Sternberg |
| Birth Date: | 14 May 1759 |
| Birth Place: | Vienna, Archduchy of Austria |
| Death Place: | Vienna, Austrian Empire |
| Place Of Burial: | Church of the Nativity of the Virgin Mary, Brno |
| Religion: | Roman Catholic |
Aloys I (Aloys Josef Johannes Nepomuk Melchior; 14 May 1759 – 24 March 1805) was the Prince of Liechtenstein from 18 August 1781 until his death in 1805.[1] He was born in Vienna, the third son of Franz Josef I, Prince of Liechtenstein.
Aloys was enlisted in the military as a youth but withdrew due to poor health. His great interest was forestry and gardening and had many trees from overseas planted around his manors for both economic and aesthetic reasons. He also decorated Eisgrub Park with ornamental buildings.Aloys I supported mining operations within his lands in Moravia in order to raise money. This included the construction of an ironworks at Olomouc.
Aloys I also expanded the Liechtenstein library through the purchase of complete collections of books. Aloys I had the architect Joseph Hardtmuth design a new palace in Herrengasse, Vienna. He hired a seasonal theater group and a permanent music group.
During his reign, Liechtenstein carried out the last execution in its history when Barbara Erni was beheaded in Eschen for theft.
He was the 836th Knight of the Order of the Golden Fleece in Austria.
Aloys married Karoline Gräfin von Manderscheid-Blankenheim (14 November 1768, in Köln – 11 June 1831, in Vienna) in Feldsberg on 15 November/16 November 1783. The couple were childless. Following Aloys' death in Vienna, Liechtenstein went to his brother Johann I.