The Ellis County Courthouse on the Town Square in Arnett, Oklahoma was built in 1912.

[2] It is a brick courthouse which was originally two stories with a hipped roof.

The roof was removed in the 1930s and a third floor was added to serve as the county jail.

[2] It was important historically as settling a county seat war.

This article about a property in Oklahoma on the National Register of Historic Places is a stub.