The Phönix C.I was an Austro-Hungarian First World War reconnaissance and general-purpose Biplane built by the Phönix Flugzeug-Werke.
The Phönix C.I was the first original design developed by the Phönix Flugzeug-Werke It was based on the Hansa-Brandenburg C.II that Phönix were building under licence. A conventional biplane with a rear fuselage/tailplane similar to aircraft designed by Ernst Heinkel. The C.I had a fixed trailskid landing gear and was powered by a Hiero 6-cylinder inline piston engine, it had two tandem open cockpits for the pilot and observer/gunner. The company built 110 C.Is and then entered service with the KuKLFT in early 1918. After the First World War 30 aircraft were built by the Swedish Army engineering department but they were fitted with a 220 hp (164 kW) Benz inline engine.