| Unit Name: | No. 520 Squadron RAF |
| Dates: | 20 September 1943 – 25 April 1946 |
| Branch: | Royal Air Force |
| Command Structure: | HQ RAF Gibraltar, Coastal Command |
| Garrison Label: | Base |
| Motto: | Tomorrow's Weather Today |
| Colors Label: | post 1950 aircraft insignia |
| Identification Symbol: | A dove holding in the beak an olive branch |
| Identification Symbol Label: | Squadron Badge heraldry |
| Identification Symbol 2: | 2M (Sep 1943 – Apr 1946) |
| Identification Symbol 2 Label: | Squadron Codes |
No. 520 Squadron RAF was a meteorological squadron of the Royal Air Force during the Second World War.
The squadron was formed at RAF Gibraltar on 20 September 1943 from 1403 Flight. Equipped with Lockheed Hudsons, it was tasked with collecting meteorological data from both the Mediterranean and Atlantic. In February 1944 it was re-equipped with Handley Page Halifaxes and these were supplemented by Supermarine Spitfires, although the Spitfires were replaced with Hawker Hurricanes a few months later. In September 1944 the squadron absorbed 1500 (BAT) Flight and its Miles Martinets, which were used for target towing. The squadron also operated the Hudson again and also the Vickers Warwick. The squadron continued to serve for a while after the war was over, and was even given an air-sea rescue task, using the Warwicks, but was disbanded at Gibraltar on 25 April 1946.
| From | To | Aircraft | Variant | |
|---|---|---|---|---|
| September 1943 | March 1944 | Mk.III | ||
| September 1943 | June 1944 | Mk.II | ||
| February 1944 | June 1945 | Mk.V | ||
| February 1944 | June 1944 | Mk.Vb | ||
| June 1944 | April 1946 | Mk.IIc | ||
| September 1944 | December 1945 | Mk.I | ||
| January 1945 | October 1945 | Lockheed Hudson | Mk.III | |
| April 1945 | April 1946 | Handley Page Halifax | Mk.III | |
| August 1945 | April 1946 | Mk.I | ||
| October 1945 | January 1946 | Lockheed Hudson | Mk.VI |
| 20 September 1943 | 25 April 1946 | already in use with 1403 Flight since 6 March 1943 |