Nagai Station is a railway station in Sumiyoshi-ku, Osaka, Japan. The station is served by the Hanwa Line of West Japan Railway Company and the Midōsuji Line of Osaka Metro; the former uses elevated tracks and the latter uses underground tracks. The subway station is assigned the station number M26. Nagai is located south of Tennoji in Sumiyoshi-ku and maintains Nagai Park and Nagai Stadium, an international standard football stadium home to the J-League team Cerezo Osaka.

The Hanwa Line is a commuter rail line in the Osaka-Kobe-Kyoto Metropolitan Area, owned and operated by West Japan Railway Company. The 61.3 km (38.1 mi) line runs between Osaka and Wakayama, Japan and has a 1.7 km branchline in a southern Osaka suburb. The name is taken from the second syllable of Osaka and the first syllable of Wakayama.