The Blue Line or Line 1 is one of the two lines of Chennai Metro, Phase 1 Project, the second being the Green line. The line stretches from Chennai International Airport to Wimco Nagar Depot. The line consists of 26 stations out of which 13 stations are underground and 13 stations are elevated.

Chennai Metro is a rapid transit system serving the city of Chennai, India. As of April 2024, the operational network consists of two colour-coded lines covering a length of 54.1 km (33.6 mi) making it the fifth longest metro system in India. Chennai Metro Rail Limited (CMRL), a joint venture between Government of India and the Government of Tamil Nadu built and operates the Chennai Metro. The system uses standard gauge and has a mix of underground and elevated stations.