The Nikkō Line (日光線, Nikkō-sen) is a railway line operated by East Japan Railway Company (JR East) which connects Utsunomiya to Nikkō.

Both the Tobu and JR East railway stations in Nikkō are located within walking distance of each other.

Handcar passenger services commenced on both lines from opening, operating until 1928.

In 1931, the lines were purchased by the Tobu Railway Co. which closed all but the Tateiwa branch, which it converted to 1,067 mm (3 ft 6 in) gauge and built a connection to Nishi-Kawada station on the Tobu Utsunomiya Line.

In 1944, electric locomotives began hauling copper ore on the line.