The Hispano-Suiza E-34, later renamed Hispano HS-34, was a Spanish single engine, tandem seat biplane, designed as a basic trainer.

Twenty five were ordered by the Aeronáutica Naval, but only five had been completed when the Spanish Civil War intervened.

The upper centre section had a large cut-out in its trailing edge for better upward visibility, and also contained the fuel tank.

The prototype and production series aircraft were powered, as the rules of the competition required, by a 105 hp (78 kW) Walter Junior four-cylinder inverted inline engine, although the second prototype was fitted with the more powerful 130 hp (97 kW) de Havilland Gipsy Major of the same configuration.

Only five had been built before the Spanish Civil War put an end to production of non-combat aircraft.

In 1935, before the Spanish Civil War, the second prototype, with its Gipsy engine, new undercarriage and Handley Page slots was displayed at the International Exposition held at Montjuich.