thumb|right|Firing of the Noonday Gun

thumb|The Noonday Gun in the background, facing [[Causeway Bay Typhoon Shelter]]

thumb|The Noonday Gun

thumb|right|References are made to [[Jardine Matheson|Jardines on the gun's descriptory plaque]]

The Noonday Gun () is a former naval artillery piece mounted on a small enclosed site near the Causeway Bay Typhoon Shelter on Hong Kong Island, Hong Kong. Owned and operated by Jardine Matheson, the gun is fired every day at noon and has become a tourist attraction.

The tradition originated over an incident in the 1860s. Jardines' main godowns and offices were located at East Point, and its private militia would fire a gun salute to welcome a Jardine tai-pan's arrival by sea. On one occasion, a senior British naval officer became annoyed by this practice because he was new to Hong Kong and did not know of such a tradition.

In 1941, during the Japanese occupation of Hong Kong, the Japanese Imperial Army dismantled the gun and it was lost. After British forces regained Hong Kong in 1945, the Royal Navy provided Jardines with a new six-pound gun with which to continue the tradition of the noonday gun. On 1 July 1947, the Noonday gun was back in operation. At the daily firing event, a Jardines' guard marches up to the site in uniform. The guard rings a bell to signal the end of the fore-noon watch, a practice which dates from the time when Jardines' main offices and warehouses were located at East Point. Then, the guard marches up to the Noonday Gun and fires it,

For a donation of HK$48,000 to the Community Chest charity, anyone can arrange to pull the lanyard that fires the gun.

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