| 820 Naval Air Squadron | |
|---|---|
 Squadron badge | |
| Active |
|
| Country |  United Kingdom |
| Branch |  Royal Navy |
| Type | Flying squadron |
| Role | Anti-submarine warfare |
| Part of | Fleet Air Arm |
| Home station | RNAS Culdrose |
| Motto(s) | Tutamen et ultor (Latin for 'Safeguard and avenger') |
| Aircraft | AgustaWestland Merlin HM2 |
| Website | Official website |
| Commanders | |
| Current commander | Commander Karen Snel MBE Royal Navy |
820 Naval Air Squadron is a Royal Navy Fleet Air Arm carrier-based squadron flying the AgustaWestland Merlin HM2 in Anti-Submarine and Airborne Early Warning (AEW) roles from RNAS Culdrose.
The Squadron was formed at RNAS Gosport on 3 April 1933 with the transferral of the Fairey III aircraft from 450 Flight and half of 445 Flight of the Fleet Air Arm of the Royal Navy.