A projection clock is an analog or digital clock equipped with a projector that creates an enlarged image of the clock face. Projection clocks are also used in advertising and merchandising High-brightness analog projection clocks can superimpose a business logo on top of the clock face, while there are low-brightness projection clocks designed for home use that project for example a logo in addition to the time.

projection clocks are radio-controlled, synchronising with a broadcast time standard and always displaying the right time without the need to set them. They may also display other information such as temperature and humidity.