Clock

A clock was an instrument for measuring time, sometimes utilising a clockwork mechanism. Clocks worn on the wrist were called watches.

The First Doctor kept an ormolu clock in the TARDIS control room. (TV: An Unearthly Child)

The Clockwork Droids used to break clocks to hide their own ticking. (TV: The Girl in the Fireplace)

A spaceship crashed into a London clock tower known as Big Ben. (TV: Aliens of London)

Jack Harkness parked his space craft by Big Ben. (TV: The Empty Child)

Bilis Manger ran a store called A Stitch in Time where he sold clocks. (TV: End of Days)

When an artist in a cafe in Paris sketched Romana, he drew her with a clock face in place of her actual face, symbolising her relationship with time. (TV: City of Death)

The Institute for Technological Advancement and Research had a beryllium atomic clock for the countdown to the new millennium. (TV: Doctor Who)

The appearance of a grandfather clock was assumed on at least three occasions by the Master's TARDIS. (TV: The Deadly Assassin, The Keeper of Traken, PROSE: The Eight Doctors)

General Mariah Learman attempted to build a time machine using clocks and mirrors. (AUDIO: The Time of the Daleks)

The Eleventh Doctor wrote a "slightly intelligent" computer virus which caused all clocks to display the number zero in order to alert the Atraxi to Prisoner Zero's whereabouts. (TV: The Eleventh Hour)

While trying to work out the secret of the Foretold, the Twelfth Doctor and other people onboard the Orient Express used clocks to keep track of the Foretold's victims' remaining seconds of life. (TV: Mummy on the Orient Express)

The Monks used the Earth's clocks to display a doomsday clock to when the world's end would come to be at Agrofuel Research Operations, due to a series of mistakes. When the Twelfth Doctor set an explosive in the lab, the doomsday clock started reverting back as the world's end wouldn't come to be any longer. (TV: The Pyramid at the End of the World)

Sundials
The Doctor's second incarnation had a in his TARDIS. (TV: The Tomb of the Cybermen, The Mind Robber, The War Games)