Ranganathan Street is a street in T. Nagar, Chennai, India. It is located on the approach to the Mambalam railway station. Many commercial establishments can be found on Ranganathan Street. One of the busiest street in the city across India.
What is presently known as Ranganathan Street ought to have been Rangaswamy Iyengar Street after the first resident of that street. It was the usual practice then to name streets after the first resident irrespective of their class, caste or contribution.
Mr.Tupil Rangaswamy Iyengar, a retired Civil Servant of the erstwhile Madras Presidency built his house in early '20s. When civil authorities approached him for his formal approval the humble, religious and self effasive gentleman requested it be named after Lord Ranganatha of Srirangam.
Usman Road is on one end of the street. At the other end is the Mambalam train station. On the street can be found many commercial establishments ranging from street hawkers selling safety pins to big stores selling gold jewelry. Many vegetable vendors also sell their wares on Ranganathan Street.
Throughout the year the street is FULL of people. Traditionally, it is busiest during Deepavali by nature of this street offering consumers the opportunity to purchase a variety of commodities. The most famous among the establishments on Ranganathan Street are the Saravana stores.
Commercial shops 
Some of the commercial shops established in Ranganathan street include:
- Saravana Stores
- Jeyachandran textile and jewellery
- Rathna stores
- Textile India
The street is a famous icon of T. Nagar and due to its proximity to Mambalam railway station, people from all parts of Chennai and Tamil Nadu flock to Ranganathan Street for shopping, especially during festive seasons.
In popular culture 
- "Not an inch to spare". The Hindu. 26 September 2007.