Hag, later known as Hag-Gastell, was a German automobile manufacturer active between 1922 and 1927. The marque originated with Hessische Automobil AG, based in Darmstadt, which produced cars from 1922 until 1925. Production was then taken over by the Waggonfabrik Gebrüder Gastell, a railway wagon manufacturer located in Mainz-Mombach, which continued building the cars until 1927.
The company was noted for its sound engineering and its decision to focus on a single model line, refining it steadily over time. This approach allowed it to remain in business longer than many other small German manufacturers of the period. Its main model, the 5/25 PS, featured a 1,305 cc four-cylinder engine of the company's own design, employing a shaft-driven single overhead camshaft. The car was offered in open two- and four-seater configurations, as well as a four-door saloon version.
After Gastell assumed control of production in 1925, the range was expanded to include a 1.5-litre sports model. Car manufacturing ceased in 1927, after which the Mainz-Mombach factory shifted its focus. Following the Second World War, the plant was used to build bus and coach bodies for Magirus-Deutz, a company that later became part of Iveco.
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