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The Hafeli DH-1 was an 1910s Swiss two-seat reconnaissance aircraft, built by aircraft department of the Eidgenossisches Konstruktions Werstatte (K + W) at Thun, Switzerland.
In 1915 K + W set up their aircraft department and employed August Hafeli as chief engineer. Hafeli had previously designed the AGO C.I and AGO C.II, German reconnaissance biplanes. His first design was the Hafeli DH-1, similar in concept to his designs for AGO Flugzeugwerke. The DH-1 was a three-bay biplane of wood and fabric construction, it had a fuselage pod with tandem seating for the two-man crew and twin booms mounting the tail. The DH-1 was powered by an Argus As II engine built under licence by Buhler Brothers Limited. Six aircraft built.