The Keisei Chiba Line (京成千葉線, Keisei Chiba-sen) is a railway line in Chiba Prefecture, Japan, operated by the private railway operator Keisei Electric Railway. It branches from the Keisei Main Line at Keisei Tsudanuma Station and connects to Chiba Chūō Station. At Chiba Chūō Station, the line is connected to the Chihara Line.

The entire line opened on 17 July 1921 as an electrified, dual-track, 1,372 mm (4 ft 6 in) gauge branch line. On 10 October 1959, the line was regauged to 1,435 mm (4 ft 8+1⁄2 in) in conjunction with the regauging of the Main Line.

In the daytime, trains from Keisei Tsudanuma to Chiharadai station and Shin-Keisei through services from Matsudo to Chiba-Chuo run at 20-minute intervals. On the Keisei Chiba Line, trains operate at 10-minute intervals. All trains are at most 6 cars long due to the platform length restriction at the intermediate stops between Keisei Tsudanuma Station and Keisei Chiba Station. Four-car trains were also used on the line, but they were discontinued at the start of the 8 December 2018 timetable revision.

There are also trains to and from Keisei Ueno Station on the Main Line during mornings and evenings. In the morning, trains towards Keisei Tsudanuma operate at the same 10-minute interval as other trains, and trains towards Chiba Chuo operate every 6 to 10 minutes.

This article incorporates material from the corresponding article in the Japanese Wikipedia.