1 Hong Kong Regiment Hong Kong Singapore RA was first formed as Hong Kong Brigade with one Mountain and Three Heavy Batteries. In August 1935, one Heavy Battery was converted to a Mountain Battery and the other two Heavy Batteries to Medium Batteries. It became the Hong Kong Regiment in May 1938 and then 1 Hong Kong Regiment in November 1939. The Regiment was captured in Hong Kong in December 1941 and disbanded in August 1946.
| Dec 34 | Formed as Hong Kong Brigade HKS RA | Hong Kong |
| Nov 39 | Re-designated 1 Hong Kong Regiment HKS RA | Hong Kong |
| Dec 41 | Captured | Hong Kong |
Batteries
| Dec 34 | 1 Mountain, 2 Heavy, 3 Heavy, 4 Heavy |
| Aug 35 | 1 Mountain, 2 Mountain, 3 Medium, 4 Medium |
| Nov 41 | 1 Mountain, 2 Mountain, 3 Medium, 4 Medium, 25 Medium |