Lierna Castle (Italian: Castello di Lierna) is an Italian castle on the eastern side of Lake Como in Lombardy, Italy. The castle is built on a peninsula that protrudes into the lake 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. 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.