Fieseler Fi 156 Storch
- Fi 156 V1: Prototype equipped with an adjustable metal propeller, registration D-IKVN (produced in 1935–1936)
- Fi 156 V2: Prototype equipped with a wooden propeller. First prototype to fly (May 10, 1936). registration D-IDVS (produced in 1935–1936)
- Fi 156 V3: Prototype identical to the V2. Test machine for various radio equipment, registration D-IGLI (produced in 1936)
- Fi 156 V4: Prototype identical to the V3. Skis for landing gear and disposable auxiliary tank. (produced in 1936–1937)
- Fi 156 V5: Production prototype for A-series. (produced in 1937)
- Fi 156 A-0: Pre-production aircraft, identical to the V3. Ten aircraft were produced. (produced in 1937–1938)
- Fi 156 A-1: First production models for service, ordered into production by the Luftwaffe with an order for 16 aircraft, the first production aircraft entered service in mid-1937. Some sources cite that only six were effectively produced. (produced in 1938)
- Fi 156 B: Fitted with a new system which could retract the normally fixed leading edge slats and had a number of minor aerodynamic cleanups, boosting the speed to 208 km/h (130 mph). The Luftwaffe did not consider such a small difference to be important and the Fi-156 B was not produced.
- Fi 156 C-0: Pre-production. Essentially a "flexible" version of the A model. (produced in 1939)
- Fi 156 C-1: Three-seat liaison version. (produced in 1939–1940)
- Fi 156 C-2: Two-seat observation type, which had a raised, fully glazed rear dorsal gun position for mounting a MG 15 machine gun for defense. (produced in 1940)
- Fi 156 C-3: Replaced the C-1 and C-2 with a "universal cockpit" suited for any role. (produced in 1940–1941)
- Fi 156 C-3/Trop: Version adapted for tropical and desert conditions. Filtered intakes. (produced in 1940–1942)
- Fi 156 C-5: Addition of a belly hardpoint for a camera pod or jettisionable auxiliary tanks. Some were fitted with skis, rather than wheels, for operation on snow. (produced in 1941–1945)
- Fi 156 C-5/Trop: Version adapted for tropical and desert conditions. Filtered intakes. (produced in 1941–1945)
- Fi 156 C-7: Three-seat liaison version. "Flat" cockpit glazing similar to the C-1.
- Fi 156 D-0: Pre-production version of the air ambulance version of the C model with a larger cockpit and extra rear fuselage-location starboard-side door for stretcher accommodation. Powered by an Argus As 10P engine. (produced in 1941)
- Fi 156 D-1: Production version of the D-0. (produced in 1942–1945)
- Fi 156 E-0: Liaison version identical to the C-1; 10 pre-production aircraft were fitted with tracked landing gear and were produced in 1941–1942.
- Fi 156 F or P: Counter insurgency version. Identical to the C-3 with machine guns in side windows and bomb-racks and smoke layers. (produced in 1942)
- Fi 156 U: Anti-submarine version. Identical to the C-3 with depth charge. (produced in 1940)
- Fi 156 K-1: Export version of the C-1 (Bought by Sweden).