The Domyoji Line (道明寺線, Dōmyōji-sen) is a single-tracked, 2.2 km short railway line operated by Kintetsu Railway, connecting Dōmyōji Station in the city of Fujiidera and Kashiwara Station in Kashiwara, both in Osaka Prefecture.

Initially steam-powered, the line was built and opened in 1898 by the Kayō Railway (河陽鉄道, Kayō tetsudō), whose plan was to connect towns of southern Kawachi Province to the then main line of the Osaka Railway (大阪鉄道, Osaka tetsudō),[1] present-day Kansai Main Line.

In the following year, the whole railway from Kashiwara to Tondabayashi[2] was transferred to the Kanan Railway (河南鉄道, Kanan tetsudō), who extended the line to Nagano (present Kawachi-Nagano) in 1902.

The new line opened in 1923 to Osaka Tennōji (大阪天王寺) (present Ōsaka Abenobashi) with 1,500 V DC electrified, the first in Japan.

One set of two-car EMU serves the line all day.