The Linkou Line (Chinese: 林口線; pinyin: Línkǒu Xiàn; Pe̍h-ōe-jī: Nâ-kháu Soàⁿ) was a railway branch line in Taiwan operated by the Taiwan Railways Administration.

The railroad was originally built to transport coal to the Linkou Power Plant and was opened on January 1, 1968.

But owing to the traffic policy of Taoyuan County, the local government made this line available for passenger service on October 27, 2005.

Passenger service on the Linkou Line ended on December 28, 2012, followed by freight services on December 31, 2012, due to the grade-separation of the northern section of the TRA Taiwan Trunk Line.

While still in operation, service was only on work days, excluding government holidays.