DA was a British automotive brand founded in 1993 by David Arthur in Warrington, Cheshire. The company focused on developing a unique three-wheeled vehicle known as the DA Mongoose.

The DA Mongoose was presented only in prototype chassis form and featured a distinctive design with two front wheels and a single rear wheel. The vehicle was intended to accommodate a range of engines, from small diesel units to Honda motorcycle engines. Despite the innovative concept, the production of intended kits for the Mongoose never materialized, and the project remained largely unrealized.

Overall, DA's brief existence highlighted the challenges faced by small automotive manufacturers in bringing niche vehicles to market.