Zadní Arnoštov is a place, that before the Treaty of Saint-Germain belonged to Austro-Hungary and was situated in the administrative region Mährisch-Trübau.
Zadní Arnoštov was formerly part of the German Empire. In the German Empire, the place was called Hinter Ehrnsdorf. The place is now called Zadní Arnoštov and belongs to Czech Republic.