The Noon-day Gun is a former naval gun mounted on a small enclosed site near the Causeway Bay typhoon shelter on Hong Kong Island, Hong Kong. There has been a gun sited in approximately this area ever since the 1860s - the original location as at East Point, which as a point of the island, has long since disappeared due to reclamation of land on the north side of the island.

The firing of the gun is a tourist attraction, a small crowd usually gathers for the daily firing of the gun at noon by an employee of Jardines who are apparently under an obligation to the Hong Kong government to continue to carry out this tradition in perpetuity, even though Hong Kong is now an SAR of the People's Republic of China and no longer the British Crown Colony it was when the tradition started.

The tradition seems to have originated over an incident in the 1860s when Jardines, who had their main godowns and offices at East Point, has their private militia fire a gun salute to welcome the tai pans arrival by sea. The Royal Navy thought that such a salute should be reserved only for government officials or senior officers of the armed services. In pennance, Jardines has been required to fire a gun at noon ever since, to serve as a time signal.

To watch the event, people must make their way to the enclosure - the easiest way to get there is to take the tunnel under the road from the basement car park in the Excelsior hotel - ask at reception if you cannot find it as the signage is poor. The Excelsior itself is owned by Mandarin Oriental hotels, which itself is a part of Jardines. At the event, the Jardines man, who wears a Jardines uniform, hands out leaflets to those gathered which describe Jardines version of the background to the gun firing.

The firing of the gun was famously mentioned in Noel Coward's humourous song "Mad Dogs and Englishmen".