Old Colombo Lighthouse and Clock Tower is a colonial-era structure and historic monument located at the junction of Chatham Street and Janadhipathi Mawatha in Colombo Fort.

It was constructed in 1857 and designed by Emily Elizabeth Ward, the wife of British Governor Sir Henry George Ward.

In 1952, the lighthouse was deactivated due to the construction of nearby buildings, but it still serves as a clock tower.