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).

Fi 256:
A five-seat civil version; two were built by Morane-Saulnier.

MS.500:
Liaison version. French produced with 240 hp French built Argus engine, as the Fi 156 had used.

MS.501:
With a 233 hp Renault 6Q inverted, air-cooled "straight six" engine instead of the Argus inverted V8.

MS.502:
Liaison version. Identical to the MS-500, with the Argus engine replaced by a 230 hp Salmson 9ab radial engine.

MS.504:
with a 304 hp Jacobs R-755-A2 radial engine.

MS.505:
Observation version of the MS-500 with the Argus engine replaced by a 304 hp Jacobs R-755-A2 radial engine.

MS.506:
with a 235 hp Lycoming engine.

Mráz K-65 áp:
Production in Czechoslovakia after World War II.

Antonov OKA-38 Aist ("stork" in Russian):
An unlicensed Soviet copy of the Fi 156, powered by a copy of a Renault MV-6 inverted, air-cooled straight-six engine (similar to the Renault 6Q), was starting production as the factory was overrun by German forces in 1941