Otto Didrik Schack, 5th Count of Schackenborg

Otto Didrik Schack, Count of Schackenborg (10 April 1758 – 18 August 1809) was a Danish aristocrat and officer.

Born into the noble family of Schack, he was the eldest child of the Danish nobleman and civil servant Hans Schack, and his first wife Ulrikke Augusta Vilhelmine Moltke, a daughter of Danish courtier, statesman and diplomat Count Adam Gottlob Moltke.

[2] In 1774, Count Schack was appointed captain à la suite in the Danish Life Regiment.

In 1786, he was appointed major in the Kronborg battalion of the Life regiment, in 1787 he was appointed commander of the Jaeger Corps of Zealand, in 1791 lieutenant colonel, in 1803 colonel, and on 12 June of the same year, he was awarded the order of the Dannebrog and became chief of the Jaeger Corps of Zealand.

At the death of his father on 21 August 1796, he inherited the Countship of Schackenborg and assumed the title of enfeoffed count.