| Name: | R 9 |
| Type: | Submarine |
| Keel: | 05/12/1917 |
| Launched: | 12/08/1918 |
| Completed: | 03/11/1918 |
| Builder: | Armstrong, Whitworth & Co Ltd |
| Yard: | High Walker |
| Yard Number: | 948 |
| Dimensions: | 508disp subm, 427disp surf, 163.75 x 15.5 x 11.6ft |
| Engines: | 1 x oil engine, 8cyl, 480hp; 2 x electric motors, 1200hp |
| Engines by: | Ruston & Hornsby, Lincoln |
| Propulsion: | 1 x Screw, 14.0knots subm, 9.5knots surf |
| Construction: | Steel |
| Armament: | 6 x 18.0ins bow torpedoes |
| History: | |
| 03/11/1918 | British Royal Navy |
| 21/02/1923 | Broken up |
| Comments: | Member of the Admiralty R Class of diesel-electric submarines |
| Designed to be faster when submerged than when on the surface | |
| The forerunner of the modern hunter-killer type of submarine | |
| 23/07/1926: Sold for breaking up by E Suren |
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