Orrin is a census-designated place and unincorporated community in Pierce County, North Dakota, United States.

[3] Old Saint John Nepomocene Cemetery, Wrought-Iron Cross Site and St. Mathias Cemetery, Wrought-Iron Cross Site, both in or near Orrin, are listed on the National Register of Historic Places.

According to the United States Census Bureau, the CDP has a total area of 0.23 square miles (0.60 km2), all land.

[4] As of the census[6] of 2010, there were 22 people, 5 households, and 5 families residing in the CDP.

There were 17 housing units at an average density of 73.9 per square mile (28.5/km2).