The O'Connor House near St. Thomas, North Dakota is a Queen Anne style house that was built in 1898.

It was listed on the National Register of Historic Places in 1990.

O'Connor was one of the earliest settlers of the area, arriving in 1881.

He had a grain elevator business, and served as Pembina County sheriff during 1888–92.

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