| Commanding Officers | |||
| Lt. G. Humphrey | 1920 | ||
| Lt. V.C. Dorman | 1921 | ||
| Lt. J. Creswell | 1922 | ||
| List not complete | |||
Laid down on 4 February 1917 R4 was launched by Mrs Maginness on 8 June 1918, the same day R3 was launched.
The history of this submarine is still being researched.