The Sixth Army of the Ottoman Empire (Turkish: Altıncı Ordu) was one of the field armies of the Ottoman Army.

It was formed in the middle 19th century during Ottoman military reforms.

It was composed of: After the Young Turk Revolution and the establishment of the Second Constitutional Era on July 3, 1908, new government initiate a major military reform.

Army headquarters were modernized.

It commanded the following active divisions:[7] The Sixth Army also had inspectorate functions for four Redif (reserve) divisions:[8][9] In August 1914, the army was structured as follows:[10] In late April 1915, the army was structured as follows:[11] In late Summer 1915, the army was structured as follows:[12] In January 1916, the army was structured as follows:[13] In August 1916, the army was structured as follows:[14] In December 1916, the army was structured as follows:[15] In August 1917, January, June 1918, the army was structured as follows:[16] In September 1918, the army was structured as follows:[17] In November 1918, the army was structured as follows:[18]