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The PZL P.1 was a Polish fighter, designed by the engineer Zygmunt Puławski, manufactured by the PZL state-owned factory. It remained a prototype, but it was the first of the Polish PZL gull wing fighter series, leading to the PZL P.7, PZL P.11 and PZL P.24.
The Renard Epervier was a Belgian prototype single-seat all-metal fighter monoplane designed by Alfred Renard at the Societé Anonyme Avions et Moteurs Renard for a government-sponsored design contest in 1928. The Epervier Type 2 was built and flown in 1928, by Belgian aircraft manufacturer Stampe et Vertongen. It carried an armament of two synchronised 7.7mm guns and was lost in September 1928 after failing to recover from a flat spin. A second prototype, the Epervier Type 2bis, introduced revised streamlined fairings for the cantilever mainwheel legs, mainwheel spats and cylinder aft-fairings and was built by SABCA.
The SIAI S.52 was an Italian fighter prototype of 1924.
The Nieuport-Delage NiD 120 series was a series of French single-seat parasol monoplane fighter aircraft of the 1930s. It was built in a number of versions, fitted with various types of engines, with six aircraft designated NiD 123 being sold to Peru.
The Romano R.90 was a prototype single-seat French floatplane fighter of the 1930s. A single example of the R.90 was built, but the type did form the basis of the Romano R.83 and Romano R.92 fighters which were built in secret for the Spanish Republicans during the Spanish Civil War.
The Hispano Suiza E-30, later renamed Hispano E-30, was designed in Spain in 1930 as a multi-purpose intermediate trainer. It was a single engine, parasol wing monoplane. About 25 served with the Spanish armed forces until 1945.
The Nieuport-Delage NiD 48 was a French single-engine parasol wing light fighter aircraft, designed and built in the 1920s. Its performance was not markedly better than that of the much heavier Nieuport-Delage NiD 62 then going into production, so only two were flown.
The Wibault Wib 1, Wib C1 or, later, Wib 1 C1 was a French World War I single seat, single engine fighter aircraft prototype. Flown near the end of the war, it was not selected for production.
The Wibault 3 or Wibault Wib 3 C.1 was a French parasol wing prototype fighter aircraft from the 1920s, designed for high altitude operations. Its development was abandoned after repeated materials failure in its supercharger.
The Wibault 8 or Wib 8 Simoun (Simoon) was a tandem seat, parasol wing fighter aircraft designed and built in France to a 1925 specification which was later withdrawn; only one Wib 8 was completed.
The Wibault 12 Sirocco or Wib 12 Sirocco was a two-seat, parasol wing fighter aircraft designed and built in France in the 1920s. Three fighter prototypes were completed, one for the RAF and two Army co-operation variants. There was no series production.
The Wibault 13C.1 Trombe (Whirlwind), later known as the Wib 130C.1 Trombe was a single seat, parasol wing lightweight fighter aircraft designed and built in France in the 1920s. It was developed into the more powerful Wib 170C.1 Tornade (Tornado) but government interest in lightweight fighters soon waned.
The Wibault Wib 210 C.1 was a single engine, single seat low wing monoplane fighter aircraft, designed and built in France in the late 1920s. Flight tests revealed vibration problems and development was quickly abandoned.
The Wibault 313, Wibault Wib 313 or Penhoët Wibault Wib 313 was a single engine, single seat low wing monoplane fighter aircraft, designed and built in France in the early 1930s. It was entered into a government competitive tender programme but was not ordered.
The Letov Š-7 was a single-seat, single-engine biplane fighter aircraft designed and built in Czechoslovakia in the early 1920s. It was designed for a single-seat fighter competition but did not reach production.
The Letov Š-22 was a single-seat, single-engine aircraft designed and built in Czechoslovakia in the mid-1920s. A parasol-wing Dewoitine-style fighter, it was not successful, and only one was built.
The Dewoitine D.15 was a single-engine, single-seat biplane fighter aircraft built in France in the 1920s. Intended to offer structural simplifications when compared with monoplanes, it had a disappointing performance and was soon abandoned.
The Dewoitine D.25 was a single-engine, two-seat, parasol-wing fighter aircraft built in France in the 1920s. The 1925 French two-seat fighter programme was cancelled before any orders were placed, but four examples were exported to Argentina.
The Wibault 10/II Tramontane was a two-seat reconnaissance aircraft designed and built by Société des Avions Michel Wibault in France for the French military 1923 A.2 competition for a 2-seater reconnaissance aircraft.
The Wibault 260 R.2 was a contender for a French government contract for a long range, two seat reconnaissance aircraft, issued in 1928. There were eight prototypes in the 1931-2 contest and the Wibault was not selected for production.