891 Naval Air Squadron was an aircraft squadron of the Royal Navy's Fleet Air Arm during World War II. The unit was equipped with Hellcat IIs, operating in the Pacific as night fighters. In August 1942 the squadron transferred from RNAS Lee-on-Solent where it had been formed to RNAS Charlton Horethorne with six Sea Hurricanes to prepare for carrier operations, later transferring to RNAS St Merryn and then embarking on HMS Dasher to take part in Operation Torch.