The Albatros D.X was a German prototype single-seat fighter biplane developed in 1918 in parallel with the D.IX. It used the same slab-sided, flat-bottomed fuselage (a departure from previous Albatros designs) but was powered by a 145 kW (195 hp) Benz Bz.IIIbo water-cooled vee-8 engine in place of the D.IX's Mercedes D.IIIa straight-six. The D.X participated in the second D-type contest at Adlershof in June 1918, but development ceased at the prototype stage.