The Yotsubashi Line(四つ橋線,Yotsubashi-sen?) is an underground rapid transit line in Osaka, Japan, operated by the Osaka Municipal Subway. The line connects Umeda, Hommachi, Yotsubashi, Namba, Daikokuchō and Suminoe, and runs parallel to the Midōsuji Line from Daikokuchō to Nishi-Umeda. Its official name is Rapid Electric Tramway Line No. 3(高速電気軌道第3号線?), while the Osaka Municipal Transportation Bureau refers to it as Osaka City Rapid Railway Line No. 3(大阪市高速鉄道第3号線?), and in MLIT publications, it is written as Line No. 3 (Yotsubashi Line)(3号線（四つ橋線）?). Station numbers are indicated by the letter Y.