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The Ulen Sword is an artifact which was unearthed in a field 3 1⁄4 miles west of Ulen in Clay County, Minnesota. It is currently on display in the Ulen Museum which is operated by the Ulen Historical Society. At first purported to be a Viking sword, it bears little resemblance to any sword of known early Medieval provenance and is more probably a 19th-century military sword. 
The sword was found buried underground by Hans O. Hansen on his farm on April 20, 1911. Because of drought, Hansen decided to set his plow blades much deeper than usual, and unearthed the artifact. The blade of the Ulen sword is said to have had a 1⁄16-inch covering of rust, which Hansen polished away. The blade is 16 inches (410 mm) long. The end of the sword has been blunted by a hammer or some other instrument. The pommel and the thick crossguard are made of brass. The sword's crossguard has a design on each side: one side depicts a helmeted soldier, and the reverse is a breastplate covering a dagger and two crossed axes.
- "29.11 Ulen Sword". The Viking Answer Lady. Retrieved October 16, 2015.
- Rath, Jay; Elizabeth McBride; Chris Roerden (1998) The M-files: True Reports of Minnesota's Unexplained Phenomena (Big Earth Publishing) ISBN 9780915024667
- Oakeshott, R.E. (1996) The Archaeology of Weapons, Arms and Armour from Prehistory to the Age of Chivalry (New York: Dover Publications Inc) ISBN 978048629288-5.