The Purple Line is a part of the Namma Metro rail system for the city of Bengaluru, Karnataka, India. As of 2023, the line is 43.49 km (27.02 mi) long and spans 37 stations from Challaghatta in the southwest to Whitefield (Kadugodi) to the east. The Purple Line is mostly elevated, with 31 elevated stations, 5 underground stations and 1 at-grade station. The Line passes through many prime activity centers of the city including Whitefield, Krishnarajapura, MG Road, Vidhana Soudha and Majestic station, which is an interchange station between Purple and Green Lines. Phase I of the Purple Line was the first underground metro section in South India.

Namma Metro, also known as Bengaluru Metro, is a rapid transit system serving the city of Bengaluru, the capital city of the state of Karnataka, India. It is the second longest operational metro network in India with an operational length of 73.75 kilometers, just behind Delhi Metro. Upon its inauguration, it became the first underground metro system in South India. Namma Metro has a mix of underground, at grade, and elevated stations. Out of the 66 operational metro stations of Namma Metro as of October 2023, there are 57 elevated stations, eight underground stations and one at-grade station. The system runs on standard-gauge tracks.