Super Cassettes Industries Private Limited, doing business as T-Series, is an Indian music record label and film production company founded by Gulshan Kumar on 11 July 1983. It is primarily known for Hindi film soundtracks and Indi-pop music. T-Series is the largest music record label in India, with up to a 35% share of the Indian music market. As of October 2024, T-Series also owns and operates the most-viewed and the second most-subscribed YouTube channel, with over 278 million subscribers and 272 billion views. While best known as a music label, T-Series has produced more than 90 films, and is established a leading film production company of Hindi cinema.

Kumar, initially a fruit juice seller in Delhi, founded T-Series to sell pirated Hindi songs before the company eventually began producing new music. Their breakthrough came with the soundtrack for the 1988 Bollywood blockbuster Qayamat Se Qayamat Tak, composed by Anand–Milind, written by Majrooh Sultanpuri, and starring Aamir Khan and Juhi Chawla, which became one of the best-selling Indian music albums of the 1980s, with over 8 million sales. They eventually became a leading music label with the release of Aashiqui (1990), composed by Nadeem–Shravan, which sold 20 million copies and became the best-selling Indian soundtrack album of all time. However, Gulshan Kumar was murdered by the Mumbai mafia syndicate D-Company on 12 August 1997. Since then, T-Series has been led by his son Bhushan Kumar and younger brother Krishan Kumar.

On YouTube, T-Series has a multi-channel network, with 30 channels (including Lahari Music) that have over 382.3 million subscribers as of 15 December 2021. The company's YouTube team consists of 13 people at the T-Series headquarters. The company's main T-Series channel on YouTube primarily shows music videos as well as film trailers. It became the most-viewed YouTube channel in January 2017. T-Series's channel was also the most-subscribed channel on YouTube from 14 April 2019 to 2 June 2024. The T-Series channel primarily features content in the Hindi language, and occasionally several other languages including Bhojpuri, Punjabi and English. T-Series also have other channels dedicated to content in several Indian languages including Bengali, Bhojpuri, Punjabi, Tamil, Telugu, Malayalam, Kannada, Gujarati, Marathi and Rajasthani.