The Orange Line is an East-West line of the Kaohsiung Metro in Kaohsiung, Taiwan. It opened on 14 September 2008, the day of Mid-Autumn Festival, for a week-long free trial service. After the free trial service, the Kaohsiung Metro offered a month-long single one-way promotional NT$15 service on both the Red and the Orange line, with regular ticket price applies after this.

Kaohsiung Metro (Chinese: 高雄大眾捷運系統, 高雄捷運) is a rapid transit and light rail system covering the metropolitan area of Kaohsiung, Taiwan. Its rapid transit network is known as Kaohsiung Mass Rapid Transit System or Kaohsiung Rapid Transit (KRT). Construction of the MRT started in October 2001. The MRT opened in 2008 and the Circular light rail in 2015. Kaohsiung Metro is operated by the Kaohsiung Rapid Transit Corporation (KRTC; Chinese: 高雄捷運公司) under a BOT contract the company signed with the Kaohsiung City Government.