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Delahaye automobile was an automotive manufacturing company founded by Émile Delahaye in 1894, in Tours, France, his home town. His first cars were belt-driven, with single- or twin-cylinder engines mounted at the rear. His Type One was an instant success, and he urgently needed investment capital and a larger manufacturing facility. Both were provided by a new Delahaye owner and fellow racer, George Morane, and his brother-in-law Leon Desmarais, who partnered with Émile in the incorporation of the new automotive company, "Societe Des Automobiles Delahaye", in 1898. All three worked with the foundry workers to assemble the new machines, but middle-aged Émile was not in good health.

In January 1901, he found himself unable to capably continue, and resigned, selling his shares to his two equal partners. Émile Delahaye died soon after, in 1905. Delahaye had hired two instrumental men, Charles Weiffenbach and Amédée Varlet in 1898, to assist the three partners. Both were graduate mechanical engineers, and they remained with Delahaye their entire working careers. Weiffenbach was appointed Manager of Operations, and, with the blessing of both George Morane and Leon Desmarais, assumed control over all of Delahaye's operations and much of its decision-making, in 1906.

Amédée Varlet was the company's design-engineer, with a number of innovative inventions to his credit, generated between 1905 and 1914, which Delahaye patented. These included the twin-cam multi-valve engine, and the V6 configuration. Varlet continued in this role until he eventually took over the Drawing Office, at 76 years of age, when much younger Jean François was hired in 1932 as chief design-engineer. In 1932, Varlet was instructed by Weiffenbach, under direction from majority shareholder Madame Desmarais, Leon Desmarais' widow, to set up the company's Racing Department, assisted by Jean François. Those who knew him well at the factory affectionately referred to Charles Weiffenbach as "Monsieur Charles".

Delahaye began experimenting with belt-driven cars while manager of the Brethon Foundry and Machine-works in Tours, in 1894. These experiments encouraged an entry in the 1896 Paris–Marseille–Paris race, held between 24 September-3 October 1896, fielding one car for himself and one for sportsman Ernest Archdeacon. The winning Panhard averaged 15.7 mph (25.3 km/h); Archdeacon came sixth, averaging 14 mph (23 km/h), while Delahaye himself was eighth, averaging 12.5 mph (20.1 km/h).

For the 1897 Paris-Dieppe, the 6 hp (4.5 kW; 6.1 PS) four-cylinder Delahayes ran in four- and six-seater classes, with a full complement of passengers. Archdeacon was third in the four-seaters behind a De Dion-Bouton and a Panhard, Courtois winning the six-seater class, ahead of the only other car in the class.

In March 1898, 6 hp (4.5 kW; 6.1 PS) the Delahayes of Georges Morane and Courtois came sixteenth and twenty-eighth at the Marseilles-Nice rally, while at the Course de Perigeux in May, De Solages finished sixth in a field of ten. The July Paris-Amsterdam-Paris earned a satisfying class win for Giver in his Delahaye; the overall win went to Panhard.

Soon after the new company was formed in 1898, the firm moved its manufacturing from Tours to Paris, into its new factory (a former hydraulic machinery plant that Morane and his brother-in-law Leon Desmarais had inherited from Morane's father). Charles Weiffenbach was named Operations Manager. Delahaye would produce three models there, until the close of the 19th century: two twins, the 2.2-litre 4.5 hp (3.4 kW; 4.6 PS) Type 1 and 6 hp (4.5 kW; 6.1 PS) Type 2, and the lighter Type 0 (which proved capable of up to 22 mph (35 km/h)), with a 1.4-liter single rated between 5 and 7 hp (3.7 and 5.2 kW; 5.1 and 7.1 PS). All three had bicycle-style steering, water-cooled engines mounted in the rear, automatic valves, surface carburetors, and trembler coil ignition; drive was a combination of belt and chain, with three forward speeds and one reverse.

In 1899, Archdeacon piloted an 8 hp (6.0 kW; 8.1 PS) racer in the Nice-Castellane-Nice rally, coming eighth, while teammate Buissot's 8 hp (6.0 kW; 8.1 PS) was twelfth.

Founder Émile Delahaye retired in 1901, leaving Desmarais and Morane in control; Weiffenbach took over from them in 1906. Delahaye's racing days were over with Émile Delahaye's death. Charles Weiffenbach had no interest in racing, and focused his production on responsible motorized automotive chassis, heavy commercial vehicles, and early firetrucks for the French government. Race-cars had become a thing of the past for Delahaye, until 1933, when Madame Desmarais caused her company to change direction 180 degrees, and return to racing.

The new 10B debuted in 1902. It had a 2,199 cc (134.2 cu in) (100 by 140 mm (3.9 by 5.5 in)) vertical twin rated 12/14 hp by RAC, mounted in front, with removable cylinder head, steering wheel (rather than bicycle handles or tiller), and chain drive. Delahaye also entered the Paris-Vienna rally with a 16 hp (12 kW; 16 PS) four; Pirmez was thirty-seventh in the voiturette class. At the same year's Ardennes event, Perrin's 16 hp (12 kW; 16 PS) four came tenth.

Also in 1902, the singles and twins ceased to be offered except as light vans; before production ceased in 1904, about 850 had been built.

Delahaye's first production four, the Type 13B, with 24/27 hp 4.4-litre, appeared in 1903. The model range expanded in 1904, including the 4.9-litre 28 hp (21 kW; 28 PS) four-cylinder Type 21, the mid-priced Type 16, and the two-cylinder Type 15B. These were joined in 1905 by a chain-driven 8-litre luxury model, one of which was purchased by King Alfonso XIII of Spain.

All 1907 models featured half-elliptic springs at the rear as well as transverse leaf springs, and while shaft drive appeared that year, chain drive was retained on luxury models until 1911. In 1908, the Type 32 was the company's first to offer an L-head monoblock engine.

Protos began licence production of Delahayes in Germany in 1907, while in 1909, h. M. Hobson began importing Delahayes to Britain. Also in 1909, White pirated the Delahaye design; the First World War interrupted any efforts to recover damages.

Delahaye invented and pioneered the V6 engine in 1911, with a 30° 3.2-litre twin-cam, in the Type 44; the invention is credited to Amédée Varlet, Delahaye's chief design-engineer at the time. The Type 44 was not a success and production stopped in 1914. The Type 44 was the only V-6 engine ever made by Delahaye, and it was the last time the company used a twin-cam engine.

Varlet also designed the Delahaye "Titan" marine engine, an enormous cast-iron four cylinder engine that was fitted into purpose-built speedboat "La Dubonnet" which briefly held the World Speed Record on Water. With the 'Titan', Amédée Varlet had invented the multi-valve twin-cam engine in 1905, the same year that Émile Delahaye died.

At the Paris factory, Delahaye continued to manufacture cars, trucks, and a few buses. By the end of World War I, their major income was from their truck business that included France's firetrucks.

After the war, Delahaye switched to a modest form of assembly line production, following the example of Ford, hampered by the "extensive and not particularly standardized range" of cars for Chenard et Walcker, and itself, and farm machines for the FAR Tractor Company. The collaboration with FAR Tractor Company and Chenard et Walcker did not last long. This continued until continually reduced sales volume made a change necessary, for the company to survive. It has been alleged that Monsieur Charles met with his friend, competitor Ettore Bugatti, to seek his opinion on turning Delahaye around. Whether or not this meeting actually occurred, it is on record that Madame Leon Desmarais, the majority shareholder and Leon Desmarais' widow, instructed Charles Weiffenbach to come up with a new higher quality automotive-chassis line with vastly improved horsepower, and re-establish a racing department. That pivotal decision was made in 1932, the year that Jean François was hired. By 1933, Delahaye was back in the racing game, and promptly went about winning events and setting records.

At the 1933 Paris Salon, Delahaye showed the Superluxe, with a 3.2-litre six, transverse independent front suspension, and Cotal preselector or synchromesh-equipped manual transmission. It would be accompanied in the model range by a 2,150 cc (131 cu in) four (essentially a cut-down six), and a sporting variant, the 18 Sport.

In 1934, Delahaye set eighteen class records at Montlhéry, in a specially-prepared, stripped and streamlined 18 Sport. They also introduced the 134N, a 12cv car with a 2.15-litre four-cylinder engine, and the 18cv Type 138, powered by a 3.2-litre six — both engines derived from their successful truck engines. In 1935, success in the Alpine Trial led to the introduction of the sporting Type 135 "Coupe des Alpes". By the end of 1935, Delahaye had won eighteen minor French sports car events and a number of hill-climbs, and came fifth at Le Mans.

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