The A8 L Security is an armoured version of the A8 L with class VR 7 ballistic protection standard (tested as per BRV 2009 guidelines), resistance to explosions against a military hand grenade (tested as per ERV 2010 guidelines), with certain areas of the armouring complies with the criteria for class VR 9 and VR 10, a core safety cell made from hot-formed armoured steel, aramide fabric, ceramics, special alloyed aluminium and multilayer glass; overlapping protective materials at the joints, aluminum side sills with solid steel sections, aluminum alloy armored floor, side windows, windshield and rear window made of special glass with a polycarbonate coating; optional electromechanical window openers, closing assist feature comes standard for the doors, communication box in the luggage compartment (light ceramic doors, aluminum frame), optional battery and the fuel tank protection, two-way communication system with a speaker in the single-frame grille and microphones for the cabin and exterior, an emergency exit system with pyrotechnical separating screws in the hinges, fire extinguisher system, emergency fresh-air system with two oxygen cartridges, a smoke extractor for the passenger compartment, an LED signaling system for convoy travel, flashing lights, a siren, a preparation for professional mobile radio systems, a flag holder, a permanently installed telephone, an accident data recorder, an additional rearview camera and a heated windshield plus partially heated side windows, four-zone climate control system with an ionizer to freshen the air, electric rear blinds, the sonorous Bose surround sound system and a TV tuner, rear are two individual seats with power adjustment, front comfort seats with heating and optional massage and ventilation functions, standard full-leather package, optional relaxation seat (adjustable right-hand rear seat with a power-adjustable footrest, heating and massage), optional center console with large storage compartments and rear seat entertainment system with two 10.2-inch displays, optional folding table, optional refrigerator optional parking heater, Bluetooth car phone online, integrated UMTS module, optional separate telephone handsets, 19-inch forged wheels featuring in semipolished two-tone finish, 255/720 tires with a high load index of 117, synthetic rings on the rims, optional full-size spare tire.

The first model included a W12 engine rated 368 kW (500 PS) and 625 N·m (461 lbf·ft), with delivery began in late summer 2011. An additional engine model with improved fuel efficiency went on sale in 2012.

The vehicle was unveiled at the 2011 Geneva Motor Show.

Deliveries began in late summer 2011.