The XX Corps of the Ottoman Empire (Turkish: 20 nci Kolordu or Yirminci Kolordu) was one of the corps of the Ottoman Army.

It was formed during World War I.

In December 1916, the corps was structured as follows:[2][3] In August 1917, the corps was structured as follows:[6] In June 1918, September 1918, the corps was structured as follows:[7] In November 1918, the corps was structured as follows:[8] In January 1919, the corps was structured as follows:[9][10]