The 66th Corps (German: Generalkommando zbV 66) was a corps formation of the German Army in World War I.

With the onset of trench warfare, the German Army recognised that it was no longer possible to maintain the traditional Corps unit, that is, one made up of two divisions.

Therefore, under the Hindenburg regime (from summer 1916), new Corps headquarters were created without organic divisions.

[5] These new Corps were designated General Commands for Special Use (German: Generalkommandos zur besonderen Verwendung).

By the end of the war, the Corps was serving on the Western Front as part of 19th Army, Heeresgruppe Herzog Albrecht von Württemberg with the following composition:[6] The 66th Corps had the following commanders during its existence:[7][8]