The Shad-Wyck was an American automobile manufactured from 1917 until 1923 in Frankfort, Indiana.
Run by the Shadburne Brothers of Chicago, the company's initial offerings seem to have been rebranded Bour-Davis cars. The company had been purchased by the brothers and production moved from Detroit to Frankfort. They announced that they would also be producing cars to their own designs but there is doubt if this ever happened. Bour-Davis was sold again to the Louisiana Motor Car Company and moved to Shreveport where production continued until 1923.
A new line of Shad-Wyck models was announced in 1920; depending on which charts one read, the cars were claimed to have two different models of engine. It is uncertain if any cars were actually made. The cars never went into production.