National Route 104 (国道104号, Kokudō Hyakuyongō) is a national highway of Japan connecting the cities of Hachinohe in southeastern Aomori Prefecture and Ōdate in northern Akita Prefecture in northern Japan.

It travels east to west and has a total length of 126.3 kilometers (78.5 mi).

National Route 104 has a total length of 126.3 kilometers (78.5 mi).

From its junction with National Route 454 in Hachinohe to the beginning of its unsigned concurrency with National Route 103 in Kazuno, the highway is known as the Shirahagi Line.

[3] All junctions listed are at-grade intersections unless noted otherwise.