Correctly naming the WW2 era Italian aircraft can be very tricky, as in many cases conflicting naming procedures were used for the same aircraft even in official documents and in the factory names painted on the airframes. So there is ample evidence (both documental and photographic) to support several different "official" naming conventions.
Just to name a few examples :
the Macchi 202 could have the name painted on the airframes as "AeronauticaMacchi C.202" (Macchi production aircraft) or "AerMacchi C.202" (Ambrosini production, and some Macchi) or "M.C.202" (Breda production). But on documents it is almost always called just Macchi (or AerMacchi) C.202 or MC.202 or M.C.202.
the FIAT CR.42 can be found also as FIAT C.R.42 or FIAT CR42 or with the factory name indicated as Fiat.
the Breda aircraft had usually their name painted on the airframes as "Breda xx", but at least on some airplane the lettering was a more conventional "Breda Ba.xx".
the Savoia-Marchetti planes were numbered as S.xx until the S.81, and later as SM.xx. But the models that remained in continuous production over both periods can be found named in both ways (like the S.79/SM.79). Also from 1943 on the factory changed its name to SIAI-Marchetti, so this name should be used for all airframes built after October 1943.
The names listed are therefore the most commonly used in english language, but several other different naming styles could claim to be at least as much correct, or even more so.
Versions and prototypes
Only the "official" versions are listed, but different production batches could sometimes have rather major differences from the basic model. The airplanes that did not proceded beyond the prototypes stage are listed in boldface.
Italian military aircraft, 1940-1945
Fighters and fighter-bombers
AUSA AUT 18 - (1939) Single engine, single seat fighter, FIAT A-80 R.C.41 radial engine, 1 prototype only
Caproni-Vizzola F.4 - (1940) Single engine, single seat fighter, DB-601 in-line engine, 1 prototype only (converted from one of the pre-production F.5).
Caproni-Vizzola F.5 - (1939) Single engine, single seat fighter, alternate version of the F.4 with FIAT A.74 R.C.38 radial engine, 2 prototypes and 12 pre-production (1 used for the F.4 prototype, the other 11 saw limited operational use)
Caproni-Vizzola F.6 M - (1941) Single engine, single seat fighter, developement of the F.5 with DB.605A in-line engine, 1 prototype only.
Variants:
F.6 Z (1943 - with x-type Isotta Fraschini R.C.25/60 engine, 1 prototype only)
FIAT CR.25 bis - (1939) Two engines, two seats escort fighter/recon aircraft, 2 prototypes, 10 pre-production version built.
FIAT CR.32 - (1933) Single engine, single seat biplane fighter, 2 prototypes, 23 pre-production and 291 operational version built.
Variants:
CR.32 bis (1935 - fighter-bomber version with provision for a bomb-rack, 328 built).
G.50 V (1941 - DB.601A in-line engine, 1 prototype only)
FIAT G.55 "Centauro" - (1942) Single engine, single seat fighter, DB.605A in-line engine, 3 prototypes, 31 pre-production, 230 operational version built
Variants:
G.55 S (1945 - fighter-torpedo bomber, 1 prototype only converted from a standard production plane)
Macchi MC.202 "Folgore" - (1941) Single engine, single seat fighter, Daimler-Benz DB 601 or Alfa Romeo RA 1000 RC.41 in-line engine, approx 1100 built (all versions)
Variants:
MC.202 AS (1941 - sand filters, increased armament)
M.C.202AS/CB (1942 - fighter bomber version with bombs racks)
Macchi MC.205 V "Veltro" - (1943) Single engine, single seat fighter, FIAT RA 1050 RC.58 "Tifone" in-line engine, 262 built (all versions)
Variants :
M.C.205S (1943 - Long range version, 18 converted from standard models)
MC.205 N1 "Orione" (1944 - High altitude version)
MC.205 N2 "Orione" (1944 - High altitude, increased armament version)
Piaggio P.119 (1942) - Single engine, single seat fighter, Piaggio P.XV RC 45 radial engine. 1 prototype only
Reggiane Re.2000 "Falco" - (1940) Single engine, single seat fighter, Piaggio P.XI R.C.40 radial engine, 1 prototype and 28 operational built for the Ryal Italian Air Force (plus another 128 for export)
Variants :
Re.2000 GA (1941 - long range variant, 12 converted from standard airframes)
Re.2000 Cat. (1942 - catapult-launched, naval version, 10 converted from standard airframes)
Reggiane Re.2001 "Falco" - (1941) Single engine, single seat fighter, Alfa Romeo RA 1000 RC 41-la in-line engine, 2 prototypes and 252 operational built (all variants)
Re.2001 OR (1942, aircraft carrier fighter-bomber version, 10 built)
Re.2001 Delta (1942, with Isotta-Fraschini "Delta" IV R.C. 16/48 in-line engine, 1 prototype only)
Reggiane Re.2002 "Ariete" - (1942) Single engine, single seat fighter-bomber, Piaggio P.XIX R.C.45 "Turbine" radial engine, 251built
Reggiane Re.2005 "Sagittario" - (1943) Single engine, single seat fighter, Daimler-Benz DB 605A in-line engine, 2 prototypes and 34 operational version built
Savoia-Marchetti SM.91 - (1943) Two-engines, two-seats heavy fighter, Daimler-Benz DB 605A-1 in-line engines, 2 protoypes only.
SIAI-Marchetti SM.92 - (1943) Two-engines, two-seats heavy fighter, Daimler-Benz DB 605A-1 in-line engines, 1 protoype only.
SAI-Ambrosini SS.4 - (1939) Single engine, single seat fighter, Isotta-Fraschini "Asso" XI R.C.40 in line engine, 1 prototype only
SAI-Ambrosini 107 - (1940) Single engine, single seat fighter, Isotta Fraschini "Gamma" R.C.35-I in-line engine, 1 prototype only
SAI-Ambrosini 207 - (1940) Single engine, single seat fighter, Isotta Fraschini "Delta" R.C.40 in-line engine, 2 prototypes and 12 pre-production version built
SAI-Ambrosini 403 "Dardo" - (1943) Single engine, single seat fighter, Isotta Fraschini "Delta" R.C.40 in line engine, 1 prototypes only
Reggiane Re.2003 - (1941) - Single engine, two seats recon, Piaggio P.XI/bis R.C.40 radial engine, 2 protoypes only (1 converted from a Re.2000 airframe and 1 converted from a Re.2002 airframe.
Correctly naming the WW2 era Italian aircraft can be very tricky, as in many cases conflicting naming procedures were used for the same aircraft even in official documents and in the factory names painted on the airframes. So there is ample evidence (both documental and photographic) to support several different "official" naming conventions.
Just to name a few examples :
the Macchi 202 could have the name painted on the airframes as "AeronauticaMacchi C.202" (Macchi production aircraft) or "AerMacchi C.202" (Ambrosini production, and some Macchi) or "M.C.202" (Breda production). But on documents it is almost always called just Macchi (or AerMacchi) C.202 or MC.202 or M.C.202.
the FIAT CR.42 can be found also as FIAT C.R.42 or FIAT CR42 or with the factory name indicated as Fiat.
the Breda aircraft had usually their name painted on the airframes as "Breda xx", but at least on some airplane the lettering was a more conventional "Breda Ba.xx".
the Savoia-Marchetti planes were numbered as S.xx until the S.81, and later as SM.xx. But the models that remained in continuous production over both periods can be found named in both ways (like the S.79/SM.79). Also from 1943 on the factory changed its name to SIAI-Marchetti, so this name should be used for all airframes built after October 1943.
The names listed are therefore the most commonly used in english language, but several other different naming styles could claim to be at least as much correct, or even more so.
Versions and prototypes
Only the "official" versions are listed, but different production batches could sometimes have rather major differences from the basic model. The airplanes that did not proceded beyond the prototypes stage are listed in boldface.
Italian military aircraft, 1940-1945
Fighters and fighter-bombers
AUSA AUT 18 - (1939) Single engine, single seat fighter, FIAT A-80 R.C.41 radial engine, 1 prototype only
Caproni-Vizzola F.4 - (1940) Single engine, single seat fighter, DB-601 in-line engine, 1 prototype only (converted from one of the pre-production F.5).
Caproni-Vizzola F.5 - (1939) Single engine, single seat fighter, alternate version of the F.4 with FIAT A.74 R.C.38 radial engine, 2 prototypes and 12 pre-production (1 used for the F.4 prototype, the other 11 saw limited operational use)
Caproni-Vizzola F.6 M - (1941) Single engine, single seat fighter, developement of the F.5 with DB.605A in-line engine, 1 prototype only.
Variants:
F.6 Z (1943 - with x-type Isotta Fraschini R.C.25/60 engine, 1 prototype only)
FIAT CR.25 bis - (1939) Two engines, two seats escort fighter/recon aircraft, 2 prototypes, 10 pre-production version built.
FIAT CR.32 - (1933) Single engine, single seat biplane fighter, 2 prototypes, 23 pre-production and 291 operational version built.
Variants:
CR.32 bis (1935 - fighter-bomber version with provision for a bomb-rack, 328 built).
G.50 V (1941 - DB.601A in-line engine, 1 prototype only)
FIAT G.55 "Centauro" - (1942) Single engine, single seat fighter, DB.605A in-line engine, 3 prototypes, 31 pre-production, 230 operational version built
Variants:
G.55 S (1945 - fighter-torpedo bomber, 1 prototype only converted from a standard production plane)
Macchi MC.202 "Folgore" - (1941) Single engine, single seat fighter, Daimler-Benz DB 601 or Alfa Romeo RA 1000 RC.41 in-line engine, approx 1100 built (all versions)
Variants:
MC.202 AS (1941 - sand filters, increased armament)
M.C.202AS/CB (1942 - fighter bomber version with bombs racks)
Macchi MC.205 V "Veltro" - (1943) Single engine, single seat fighter, FIAT RA 1050 RC.58 "Tifone" in-line engine, 262 built (all versions)
Variants :
M.C.205S (1943 - Long range version, 18 converted from standard models)
MC.205 N1 "Orione" (1944 - High altitude version)
MC.205 N2 "Orione" (1944 - High altitude, increased armament version)
Piaggio P.119 (1942) - Single engine, single seat fighter, Piaggio P.XV RC 45 radial engine. 1 prototype only
Reggiane Re.2000 "Falco" - (1940) Single engine, single seat fighter, Piaggio P.XI R.C.40 radial engine, 1 prototype and 28 operational built for the Ryal Italian Air Force (plus another 128 for export)
Variants :
Re.2000 GA (1941 - long range variant, 12 converted from standard airframes)
Re.2000 Cat. (1942 - catapult-launched, naval version, 10 converted from standard airframes)
Reggiane Re.2001 "Falco" - (1941) Single engine, single seat fighter, Alfa Romeo RA 1000 RC 41-la in-line engine, 2 prototypes and 252 operational built (all variants)
Re.2001 OR (1942, aircraft carrier fighter-bomber version, 10 built)
Re.2001 Delta (1942, with Isotta-Fraschini "Delta" IV R.C. 16/48 in-line engine, 1 prototype only)
Reggiane Re.2002 "Ariete" - (1942) Single engine, single seat fighter-bomber, Piaggio P.XIX R.C.45 "Turbine" radial engine, 251built
Reggiane Re.2005 "Sagittario" - (1943) Single engine, single seat fighter, Daimler-Benz DB 605A in-line engine, 2 prototypes and 34 operational version built
Savoia-Marchetti SM.91 - (1943) Two-engines, two-seats heavy fighter, Daimler-Benz DB 605A-1 in-line engines, 2 protoypes only.
SIAI-Marchetti SM.92 - (1943) Two-engines, two-seats heavy fighter, Daimler-Benz DB 605A-1 in-line engines, 1 protoype only.
SAI-Ambrosini SS.4 - (1939) Single engine, single seat fighter, Isotta-Fraschini "Asso" XI R.C.40 in line engine, 1 prototype only
SAI-Ambrosini 107 - (1940) Single engine, single seat fighter, Isotta Fraschini "Gamma" R.C.35-I in-line engine, 1 prototype only
SAI-Ambrosini 207 - (1940) Single engine, single seat fighter, Isotta Fraschini "Delta" R.C.40 in-line engine, 2 prototypes and 12 pre-production version built
SAI-Ambrosini 403 "Dardo" - (1943) Single engine, single seat fighter, Isotta Fraschini "Delta" R.C.40 in line engine, 1 prototypes only
Reggiane Re.2003 - (1941) - Single engine, two seats recon, Piaggio P.XI/bis R.C.40 radial engine, 2 protoypes only (1 converted from a Re.2000 airframe and 1 converted from a Re.2002 airframe.