Shiloh is a census-designated place (CDP) in Harrison Township in Montgomery County, Ohio, United States.

It was delineated as a census-designated place at the 2000 census, at which time its population was 11,272.

The community took its name from the Shiloh Church which was established "in an early day".

There were 6,209 housing units at an average density of 1,617.7 per square mile (624.6/km2).

45.5% of all households were made up of individuals, and 15.2% had someone living alone who was 65 years of age or older.