The Uchibō Line (内房線, Uchibō-sen) is a railway line operated by the East Japan Railway Company (JR East) adjacent to Tokyo Bay, paralleling the western (i.e., inner) shore of the Bōsō Peninsula.

It connects Soga Station in the city of Chiba to Awa-Kamogawa Station in the city of Kamogawa, passing through the municipalities of Chiba, Ichihara, Sodegaura, Kisarazu, Kimitsu, Futtsu, Kyonan, Tateyama, and Minamibōsō.

Notes: The Uchibō Line operates local service with trains generally originating and terminating at Chiba Station.

Daytime local service from Chiba to Kisarazu and Kimitsu (sometimes to Kazusa-Minato) is provided by around 2 round trips per hour.

In addition, 1 round trip per hour runs from Kisarazu to Awa-Kamogawa (and to Kazusa-Ichinomiya through the Sotobō Line).