The Daimler D.I (also known by the company designation L6) was a German fighter aircraft of World War I. It was a conventional biplane design with a very small interplane gap - the top wing nearly touched the top of the fuselage. Power was provided by a Daimler D.III engine.
The L6 prototype competed in the second Idflieg competition for a new fighter design in 1918. The competition was held at Adlershof from 22 May through 21 June. This resulted in an order for 20 aircraft being placed.