The Utsunomiya Line (Japanese: 宇都宮線, romanized: Utsunomiya-sen) is the name given to a 163.5-kilometer (101.6 mi) section of the Tōhoku Main Line between Tokyo Station in Tokyo and Kuroiso Station in Nasushiobara, Tochigi, Japan.

The fastest service on the line, the rapid Rabbit, makes the run between Ueno and Utsunomiya in 1 hour and 26 minutes.

Service on the line is generally divided at Utsunomiya, though the number of through trains had been increasing steadily over the years.

South of Utsunomiya, 10- and 15-car E231-1000/E233-3000 series four-door suburban commuter EMUs with Green cars attached service the line, while to the north service was provided chiefly by 4-car 205-600 series four-door EMUs.

Rabbit trains were first operated by the Japanese National Railways as an hourly/half-hourly rapid service.

From March 2021, the commuter rapid service was consolidated into the rapid Rabbit service, which now operate two trains one-way from the Tōkaidō Line (one from Odawara and one from Kōzu) to Utsunomiya in the morning, and between three and five trains each way between Ueno and Utsunomiya in the evening.

Rapid trains operate once hourly, making limited stops.

Trains departed Ueno between 18:00 and 22:00, and Utsunomiya between 16:00 and 21:00, with approximately one round-trip per hour.

Stops include: Ueno, Urawa, Ōmiya, Higashi-Ōmiya, Hasuda, Kuki, and Koga.