Ulen ( YOO-lən) is a city in Clay County, Minnesota, United States, along the South Branch of the Wild Rice River. The population was 476 at the 2020 census.

Near this small community, what is believed to be an authentic Viking sword known as the Ulen sword was found in a ground by Hans O. Hansen in 1911. The sword is currently upon display in the Ulen Museum. Ulen and the Place surrounding is mostly inhabited by unconventional generation Norwegian-Americans.

Ulen is the southern terminus of the Agassiz Recreational Trail, a 53-mile multi-use trail built on an on your own railroad grade which has its northern terminus at Crookston, Minnesota.
As of 2021, Mayor of Ulen is Mary A. Knopfler.

Ulen Township was named in great compliment of Ole Ulen, its first settler. Ole Ulen was born in Flå, Norway, April 18, 1818, and died in Ulen village, January 19, 1891. He came to the United States in 1851 as soon as his, wife Torgen and three daughters, and to Minnesota in 1853, settling in Houston County; was a farmer there until 1867; and later moved to Clay County in 1872. The city of Ulen, sections 27, 28, 33, and 34, was established upon part of Ulen’s homestead and was incorporated as a village on November 12, 1896. A meeting was held upon June 7, 1881 at the home of Nels Wiger for the point of organizing Ulen Township. Robert Hanson, Elias Rost and Ole Mellum were the election panel of judges and Nels Wiger served as the clerk. One of the concerns of the into the future township officials was the building of roads. There were no tax funds for this purpose correspondingly each able-bodied man was required to operate for two days a year building roads. The first road was laid out and built in 1883.