Fortuna is a city in Divide County, North Dakota, United States. The population was 30 at the 2020 census. Fortuna was founded in 1913 along a Soo Line Railroad branch line running between Flaxton, North Dakota and Whitetail, Montana. The name comes from the Roman goddess of fortune and was chosen by railroad officials to note the settlers' expectations of prosperity with the arrival of the railroad. The city is located six miles from the Canada–US border and is the northernmost city on U.S. Route 85 before it crosses into Canada at Port of Oungre, Saskatchewan.