North Dakota Highway 3 (ND 3) is a 247.530-mile-long (398.361 km) major north–south state highway in North Dakota, United States, that spans the entire state. It travels from South Dakota Highway 45 (SD 45) at the South Dakota state line, south of Ashley north to Manitoba Highway 10 (PTH 10) at the International Peace Garden on the Canada–United States border.

Interstate 94 (I-94) runs east–west for 352.4 miles (567.1 km) through the southern half of the US state of North Dakota, from the Montana state line east to the Red River at Fargo. The route generally follows the route of the Northern Pacific Railway.