The Lynx AH.1 entered service with the British Army′s Army Air Corps (AAC) in 1979, followed by the Lynx HAS.2 with the Fleet Air Arm (FAA) in 1981.
The FAA fleet was upgraded to Lynx HAS.3 standard during the 1980s, and again to HMA.8 standard in the 1990s.
Most Army aircraft were upgraded to Lynx AH.7 and the later AH.9/AH.9A standards as utility helicopters; they have also served with 3 Commando Brigade Air Squadron (3 CBAS) of the Royal Marines and later, the Commando Helicopter Force (CHF) of the FAA, operating as reconnaissance and attack/utility helicopters to support the Royal Marines.
During the Cold War, it was envisioned that Army Lynxes would be paired with Westland Gazelle helicopters to counter Soviet armoured vehicles.
Lynx HAS.3 and HMA.8 variants operate as anti-submarine warfare and maritime attack helicopters armed with Sting Ray torpedoes, Sea Skua anti-ship missiles and depth charges, from Royal Navy warships.
Navy Lynx have been critical to maritime patrol operations, including non-military operations such as counter-narcotics missions.

The Lynx HAS.2 ASW variant participated in combat operations during the Falklands War in 1982.
A combination of Lynx and Westland Sea King helicopters were used to maintain continuous anti-submarine patrols in order to protect the British task force offshore from the Falkland Islands.
On 3 May, a Lynx conducted the first combat-firing of a Sea Skua missile, firing on the Argentinian patrol boat ARA Alférez Sobral, inflicting considerable damage to the vessel.
This was the first use of sea-skimming missiles in the conflict.
Although none were shot down in combat, a total of three were lost aboard vessels that were struck by attacks from Argentine aircraft, these vessels being HMS Coventry, HMS Ardent and SS Atlantic Conveyor.

On 14 May 1989, in the type's second fatal accident, Lynx HAS3GM XZ244, attached to HMS Brilliant, crashed near Mombasa, Kenya, while en route to the city's airport for a period of shore leave.
A door had detached when opened inflight and collided with the tail rotor, resulting in the aircraft splitting in half and the death of all nine personnel on board.
As a result, door modifications and inflight opening restrictions were introduced.
As of 2004, it remained the deadliest Lynx crash.

The Navy's Lynx helicopters were among Britain's contribution to the coalition against Saddam Hussein's Iraq during the 1991 Gulf War.
During the Battle of Bubiyan, the biggest naval engagement of the conflict, the Lynx and its Sea Skua missiles proved to be decisive, being responsible for the majority of individual engagements with various Iraqi Navy vessels.
By 2 February 1991, 25 Sea Skuas had been launched, out of these, 18 were confirmed as having hit their targets, and had succeeding in heavily damaging a significant portion of Iraq's navy.
Navy Lynxes were routinely used to deploy troops to oil platforms and into occupied Kuwait, as well as to perform aerial reconnaissance across the Gulf.

The British Army also deployed 24 TOW-armed Lynxes alongside an equal number of Westland Gazelle helicopters during the Gulf War.
They were assigned the mission of locating and attacking Iraqi tank concentrations, and to support the advance of coalition ground forces into Kuwait and Southern Iraq during the 100 hours war phase of the conflict.
On 26 February 1991, a Lynx of 654 Squadron AAC destroyed two MTLB armoured personnel carriers (APCs) and four T-55 tanks using TOW missiles: the engagement was the first recorded use of the missile from a British helicopter.

On 19 March 1994, during The Troubles in Northern Ireland, the IRA brought down Lynx AH.7 ZD275 of the AAC with an improvised mortar, striking it while attempting to land at Crossmaglen Army base.
The pilot managed to crash land and the aircraft was destroyed, but all crew on board survived.
Author Toby Harnden described the incident as the IRA's most successful operation against a helicopter.

Various British Lynxes were used during the NATO intervention in the conflict between Serbia and Kosovo, later known as
The Lynx AH.1 entered service with the British Army′s Army Air Corps (AAC) in 1979, followed by the Lynx HAS.2 with the Fleet Air Arm (FAA) in 1981. The FAA fleet was upgraded to Lynx HAS.3 standard during the 1980s, and again to HMA.8 standard in the 1990s. Most Army aircraft were upgraded to Lynx AH.7 and the later AH.9/AH.9A standards as utility helicopters; they have also served with 3 Commando Brigade Air Squadron (3 CBAS) of the Royal Marines and later, the Commando Helicopter Force (CHF) of the FAA, operating as reconnaissance and attack/utility helicopters to support the Royal Marines. During the Cold War, it was envisioned that Army Lynxes would be paired with Westland Gazelle helicopters to counter Soviet armoured vehicles. Lynx HAS.3 and HMA.8 variants operate as anti-submarine warfare and maritime attack helicopters armed with Sting Ray torpedoes, Sea Skua anti-ship missiles and depth charges, from Royal Navy warships. Navy Lynx have been critical to maritime patrol operations, including non-military operations such as counter-narcotics missions.
The Lynx HAS.2 ASW variant participated in combat operations during the Falklands War in 1982. A combination of Lynx and Westland Sea King helicopters were used to maintain continuous anti-submarine patrols in order to protect the British task force offshore from the Falkland Islands. On 3 May, a Lynx conducted the first combat-firing of a Sea Skua missile, firing on the Argentinian patrol boat ARA Alférez Sobral, inflicting considerable damage to the vessel. This was the first use of sea-skimming missiles in the conflict. Although none were shot down in combat, a total of three were lost aboard vessels that were struck by attacks from Argentine aircraft, these vessels being HMS Coventry, HMS Ardent and SS Atlantic Conveyor.
On 14 May 1989, in the type's second fatal accident, Lynx HAS3GM XZ244, attached to HMS Brilliant, crashed near Mombasa, Kenya, while en route to the city's airport for a period of shore leave. A door had detached when opened inflight and collided with the tail rotor, resulting in the aircraft splitting in half and the death of all nine personnel on board. As a result, door modifications and inflight opening restrictions were introduced. As of 2004, it remained the deadliest Lynx crash.
The Navy's Lynx helicopters were among Britain's contribution to the coalition against Saddam Hussein's Iraq during the 1991 Gulf War. During the Battle of Bubiyan, the biggest naval engagement of the conflict, the Lynx and its Sea Skua missiles proved to be decisive, being responsible for the majority of individual engagements with various Iraqi Navy vessels. By 2 February 1991, 25 Sea Skuas had been launched, out of these, 18 were confirmed as having hit their targets, and had succeeding in heavily damaging a significant portion of Iraq's navy. Navy Lynxes were routinely used to deploy troops to oil platforms and into occupied Kuwait, as well as to perform aerial reconnaissance across the Gulf.
The British Army also deployed 24 TOW-armed Lynxes alongside an equal number of Westland Gazelle helicopters during the Gulf War. They were assigned the mission of locating and attacking Iraqi tank concentrations, and to support the advance of coalition ground forces into Kuwait and Southern Iraq during the 100 hours war phase of the conflict. On 26 February 1991, a Lynx of 654 Squadron AAC destroyed two MTLB armoured personnel carriers (APCs) and four T-55 tanks using TOW missiles: the engagement was the first recorded use of the missile from a British helicopter.
On 19 March 1994, during The Troubles in Northern Ireland, the IRA brought down Lynx AH.7 ZD275 of the AAC with an improvised mortar, striking it while attempting to land at Crossmaglen Army base. The pilot managed to crash land and the aircraft was destroyed, but all crew on board survived. Author Toby Harnden described the incident as the IRA's most successful operation against a helicopter.
Various British Lynxes were used during the NATO intervention in the conflict between Serbia and Kosovo, later known as
Westland Lynx