| Unit Name: | No. 171 Squadron RAF |
| Dates: | 15 June 1942 – December 1942 7 September 1944 – 27 July 1945 |
| Branch: | Royal Air Force |
| Garrison Label: | Base |
| Motto: | Latin Per dolum defendimus (Confound the enemy) |
| Colors Label: | post 1950 aircraft insignia |
| Identification Symbol: | A portcullis in front of a displayed eagle |
| Identification Symbol Label: | Squadron Badge |
| Identification Symbol 2: | 6Y (1944 - 1945) |
| Identification Symbol 2 Label: | Squadron codes |
No. 171 Squadron RAF was a Royal Air Force Squadron that was a coastal reconnaissance and radio countermeasures unit in World War II.
The squadron formed on 15 June 1942 at Gatwick and equipped with Tomahawk and then Mustang aircraft, it was disbanded in December 1942 and then reformed on 8 September 1944 at North Creake, equipped with Stirling III and then Halifax Radio Countermeasures aircraft. It finally disbanded on 27 July 1945.
| Jun 1942 | Dec 1942 | I | ||
| Sep 1942 | Dec 1942 | IA | ||
| Sep 1944 | Jan 1945 | III | ||
| Oct 1944 | Jul 1945 | III |