A list of the tallest structures with clocks on their exterior that can be seen from the ground.
The first type of structure are proper Clock towers which are structures that fulfil the definition of a tower with a clock face or faces on the exterior wall or walls.
Possibly the most famous example is the colloquially termed Big Ben.
Some structures of this type were originally built as bell towers and had the clocks added later, such as the Springfield Campanille.
This division of structures with clock faces follows the general terminology used in related articles and follows Council on Tall Buildings and Urban Habitat (CTBUH) criteria.