Operators
- Afghanistan
- Afghan Air Force - Airco DH.9As and Polikarpov R-1s
- Australia
- Royal Australian Air Force: The RAAF received 28 DH.9As (RAAF serial A6-1 to A6-28). The aircraft were in service from 1920 to 1930.
- No. 1 Squadron RAAF
- No. 3 Squadron RAAF
- No. 1 Flying Training School RAAF
- Canada
- Canadian Air Force (1918-1920)
- Royal Canadian Air Force
- Iran
- Imperial Iranian Air Force
- Latvia
- Latvian Air Force
- Mongolia
- Mongolian People's Air Force : Polikarpov R-1s and R-2s
- Switzerland
- Swiss Air Force : One aircraft only.
- United Kingdom
- Royal Air Force
- No. 3 Squadron RAF
- No. 8 Squadron RAF
- No. 11 Squadron RAF
- No. 14 Squadron RAF
- No. 15 Squadron RAF
- No. 18 Squadron RAF
- No. 22 Squadron RAF
- No. 24 Squadron RAF
- No. 25 Squadron RAF
- No. 30 Squadron RAF
- No. 39 Squadron RAF
- No. 45 Squadron RAF
- No. 47 Squadron RAF
- No. 55 Squadron RAF
- No. 60 Squadron RAF
- No. 84 Squadron RAF
- No. 99 Squadron RAF
- No. 100 Squadron RAF
- No. 110 Squadron RAF
- No. 205 Squadron RAF
- No. 207 Squadron RAF
- No. 207 Squadron RAF
- No. 221 Squadron RAF
- No. 273 Squadron RAF
- No. 501 Squadron RAF
- No. 600 Squadron RAF
- No. 601 Squadron RAF
- No. 602 Squadron RAF
- No. 603 Squadron RAF
- No. 604 Squadron RAF
- No. 605 Squadron RAF
- United States
- United States Marine Corps
- Soviet Union
- Soviet Air Force : Polikarpov R-1s and R-2s
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