Maschinenfabrik Christian Hagans (Christian Hagans Engineering Works) was a German locomotive manufacturer founded on 1 July 1857 in Erfurt, Germany, by Christian Hagans.
By the mid-1860s, the company had started building locomotive boilers and other components; in 1872 the first locomotive followed, a narrow gauge engine for a rail gauge of 750 mm. As a result of shortages of space, Hagans often had to limit its operations. For example, the T 15 was built by Henschel because Hagans did not have the necessary capacity. In 1903 the factory site was moved to Ilversgehofen north of the city; only then was large-scale production possible.
On 30 June 1915 the locomotive factory was sold, with effect from 1 April 1916, to the Maschinenbau R. Wolf Magdeburg-Buckau. In 1928, steam locomotive manufacture finally came to an end in Erfurt. By then Hagans had built 1,251 locomotives. The last Hagans engine was a DRG Class 64.