Kosmonosy is a town in Mladá Boleslav District in the Central Bohemian Region of the Czech Republic.

The highest point is the hill Baba at 363 m (1,191 ft) above sea level.

The first written mention of Kosmonosy is from 1186, when Duke Frederick donated the village to the order of Knights Hospitaller.

In 1607, during the rule of Jiří of Hohenlohe, Kosmonosy became the centre of a large estate.

[4][9] The Loreta chapel and the adjacent Campanilla bell tower belongs to the most architecturally valuable buildings in the town.

The bell tower was built in 1673 and the chapel in 1702–1708 on the site of the former wooden Church of Saint Martin.

The walls of the chapel are decorated with reliefs from the life of the Virgin Mary, and statues of prophets are placed in niches.