The Naglo D.II was a German single seat quadruplane fighter, flown late in World War I.

Inboard N-form interplane struts held the upper plane high over the fuselage in place of a cabane.

It was mounted independently of the other three, fixed to a dorsal keel extension and braced on each side with a V-strut from about mid-span to the root of the wing above.

[1] The D.II was powered by a 160 hp (120 kW) Mercedes six-cylinder water-cooled engine, driving a two-blade propeller with a large, domed spinner which was blended into the round, converging contours of the fuselage.

A need to improve flight characteristics was noted; Naglo was therefore asked to present the D.II for further tests after making modifications.