| 1st Dorsetshire Artillery Volunteers Dorsetshire Royal Garrison Arrillery 522nd (Dorsetshire) Coast Regiment, RA 421st (Dorset) Coast Regiment, RA | |
|---|---|
 Letterhead of the 2nd Dorset Artillery Volunteers, 1895 | |
| Active | 29 December 1859 – 31 October 1956 |
| Country |  United Kingdom |
| Branch |  Territorial Army |
| Type | Artillery Corps |
| Role | Garrison Artillery Coast Artillery |
| Part of | Southern Coast Defences Portland Garrison |
| Garrison/HQ | Weymouth, Dorset |
The 1st Dorsetshire Artillery Volunteers and its successors were part-time coast defence units of the British Army from 1859 to 1956. Although these units saw no action, they protected the Dorset Coast, including the naval base of Portland Harbour, in both World Wars and also supplied trained gunners to siege batteries engaged on the Western Front during World War I. The unit continued in the Territorial Army after World War II.