Taiwan Ring Expressway (Chinese: 台湾环线高速公路) is a proposed, hypothetical expressway encircling the island of Taiwan as part of the National Trunk Highway System of the People's Republic of China. It is not in existence and hypothetical due to the political status of Taiwan. The People's Republic of China claims control over Taiwan while it is administered and controlled by the Republic of China. Taiwan has its own highway system and does not recognize the designation by the People's Republic of China.
According to the People's Republic of China, the expressway would pass through the cities of Taipei, Hsinchu, Taichung, Tainan, Kaohsiung, Taitung, Hualian, Yilan, Keelung, before returning to Taipei.
The route of the proposed expressway corresponds to the highways designated by Taiwan as (counterclockwise from Taipei):
National freeway 5 does not pass Keelung as proposed by the People's Republic of China.