Osio Sotto is a comune in the Province of Bergamo in the Italian region Lombardy with 12,136 inhabitants (as of 31 December 2012).
Osio Sotto located 11 km southwest of the provincial capital of Bergamo and 40 km northeast of the city of Milan.
- The parish church of San Zeno was built in the 12th century. It was rebuilt in the mid-18th century.
- The small church of the Addolorata dates from the 19th century.
- The San Donato church was built between the 14th and 15th centuries. In the 20th century the church was enlarged to its present size.
- The San Giorgio church dates from the 14th century.