The Yahiko Line (弥彦線, Yahiko-sen) is a Japanese railway line operated by East Japan Railway Company (JR East) which connects Yahiko Station in the village of Yahiko and Higashi-Sanjō Station in the city of Sanjo, both in Niigata Prefecture. The line shares its name with both Yahiko Village and nearby Mt. Yahiko.

All trains on the line operate as local services stopping at all stations. Most services run between Yahiko and Yoshida, and Yoshida and Higashi-Sanjō. A few services run the full length of the line from Yahiko to Higashi-Sanjō, and one service in the mornings in both directions runs through to the Echigo Line toward Teradomari. There is an hourly service in the mornings and evenings, and service every 2–3 hours during the mid-day.

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New E129 series EMUs were introduced on local services on the line from fiscal 2014.

The Echigo Railway opened the Yahiko to Yoshida section in 1916 and extended the line to Higashi-Sanjo in 1926. The company was nationalised in 1927.^{[citation needed]}

Freight services ceased in 1960, and the line was electrified in 1984.^{[citation needed]}