| Lierna Castle | |
| Native Name: | Castello di Lierna |
| Location: | Lierna, Lake Como |
| Map Alt: | Located in northern Italy |
| Map Size: | 270 |
| Type: | medieval castle |
| Coordinates: | 45.9658°N 9.3011°W |
| Materials: | stone and mortar |
| Built: | 10th century CE |
| Fate: |
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| Site Other: | residential |
| Ownership: | private and public museum |
| Open To Public: | in part |
| Condition: | restored |
| Battles: | Como-Milan War |
| Events: |
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Lierna Castle (Italian: '''Castello di Lierna'''|italic=no) is a castle on the eastern side of Lake Como in Lombardy, Italy. The castle is built on a peninsula that protrudes into the lake[1] and consists of a group of connected buildings, rather than a single building. The main portion of the current buildings was constructed in the 10th century in Romanesque style upon former Roman ruins.[2] The castle includes the 11th-century church of Saints Maurice and Lazarus (Chiesa dei Santi Maurizio e Lazzaro), associated with the Order of Saints Maurice and Lazarus.
The castle is occupied by the people of the frazione of Castello in the comune of Lierna.[3] [4] It is the northwesternmost of the eleven frazioni of Lierna comune.
The last military use of the castle was in the mid-16th century by Gian Giacomo Medici, known as "Medeghino" (the "small Medici"), who was primarily a mercenary.[5]