Asin Thottumkal (Malayalam: born 26 October 1985), known mononymously as Asin, is an Indian film actress, model and stage performer who acts primarily in Tamil, Telugu, and Hindi films.

Making her acting debut in Sathyan Anthikkad's Malayalam film Narendra Makan Jayakanthan Vaka (2001), Asin had her first commercial success with the Telugu film Amma Nanna O Tamila Ammayi in 2003, and won a Filmfare Best Telugu Actress Award for the film. Its remake M. Kumaran son of Mahalakshmi (2004) was her debut in Tamil and it was a huge success and she was nominated for Filmfare Best Tamil Actress Award

She received her second South Filmfare Award for Best Actress for her critically acclaimed performance in her second Blockbuster Tamil film, Ghajini (2005). She played the lead female roles in blockbusters such as the action comedy Varalaru (2006), the action thriller Pokkiri (2007) and the big budget production Dasavathaaram (2008) which established her as a superstar in the South. In late 2008, Asin made her début in Bollywood, with Ghajini, the remake of its Tamil namesake, subsequently winning the Filmfare Best Female Debut Award. She also starred in another blockbuster movie Ready (2011) opposite Salman Khan which marked her as one of the top Bollywood actresses.

Asin was born in Kochi, Kerala, India and attended Naval Public School from L.K.G.(Pre.K) through 10th standard (grade). She then attended St. Teresa's School in Kochi for her Plus Two education. After that she attended St. Teresa's College for Women in Kochi, a college affiliated with MG University, where she earned a Bachelors of Arts degree in English Literature. Her father, Joseph Thottumkal originally from a Nasrani Travancore Christian family in Thodupuzha, managed several businesses. Her mother, Seline Thottumkal remains a surgeon, who moved settlements from Cochin to Chennai to Mumbai to live with her daughter. Asin has quoted that her name means "pure and without blemish". She claims that "the 'A' in her name is from Sanskrit meaning "without", and 'sin' from English".