The Noonday Gun is located on the waterfront of the area formerly known as East Point, present-day Causeway Bay. East Point was the first plot of land in Hong Kong to be sold by the colonial government by public auctionin 1841, and was purchased by Jardine Matheson. Over the years, land reclamationhas shifted the coastline northward, and the siting of the gun has changed accordingly. The name East Point is now disused.

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 officerbecame annoyed by this practice because he was new to Hong Kong and did not know of such a tradition. This was because such a salute was normally reserved for government officials and senior officers of the armed services. As a result, Jardines was ordered, as a penalty, to fire a gun every day at noon, in perpetuity.

In 1941, during the Japanese occupation of Hong Kong, the Japanese Imperial Armydismantled 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. Following complaints that the gun was too loud, in 1961 the marine police replaced the six-pound gun with a Hotchkiss three-pounderthat saw action in the Battle of Jutland during the First World War.