Vidya Balan (pronounced [ʋɪd̪ːja baːlən]; born 1 January 1979) is an Indian actress. Known for pioneering a change in the portrayal of women in Hindi cinema with her roles in female-led films, she is the recipient of several awards, including a National Film Award and seven Filmfare Awards. She was awarded the Padma Shri by the Government of India in 2014. She was invited by the Academy of Motion Picture Arts and Sciences to join the Actors Branch in 2021.

Vidya aspired to a career in film from a young age and had her first acting role in the 1995 sitcom Hum Paanch. While pursuing a master's degree in sociology from the University of Mumbai, she made several unsuccessful attempts to start a career in film, and featured in television commercials and music videos. She made her film debut by starring in the Bengali film Bhalo Theko (2003) and received praise for her first Hindi film, the drama Parineeta (2005). This was followed by several commercial successes including Lage Raho Munna Bhai (2006) and Bhool Bhulaiyaa (2007), but her subsequent roles were met with negative reviews.

Vidya established herself by starring as headstrong women in five consecutive commercial successes, which also earned her critical and awards recognition. These were in the drama Paa (2009), the black comedy Ishqiya (2010), the thrillers No One Killed Jessica (2011) and Kahaani (2012), and the biopic The Dirty Picture (2011). The last of these won her the National Film Award for Best Actress. Following a downturn, Vidya made a career comeback by playing cheerful women balancing work and family life in Tumhari Sulu (2017) and Mission Mangal (2019). After starring in the Amazon Prime Video films Shakuntala Devi (2020), Sherni (2021), and Jalsa (2022), Vidya had her highest-grossing release in the comedy horror sequel Bhool Bhulaiyaa 3 (2024).

Vidya also promotes humanitarian causes and supports the empowerment of women. She is a member of the Indian Central Board of Film Certification and has hosted a radio show. Early in her career, she drew criticism for her fluctuating weight and dress sense, but was later credited in the media for her unconventionality. Vidya is married to the film producer Siddharth Roy Kapur.

Vidya was born on 1 January 1979 in Bombay (present-day Mumbai) into a Tamil Brahmin (Palakkad Iyer) family. Her father, P. R. Balan, worked as the executive vice-president of Digicable, and her mother, Saraswathy, is a homemaker. According to Vidya, they speak a mix of Tamil and Malayalam at her home in Palakkad, Kerala. Her elder sister, Priya Balan, works in advertising. Actress Priyamani is her second cousin. Vidya grew up in the suburban neighbourhood of Chembur and studied at St. Anthony Girls' High School.

From a young age, Vidya aspired to a career in film and was inspired by the work of actresses Shabana Azmi and Madhuri Dixit. At the age of 16, she starred in the first season of Ekta Kapoor's sitcom Hum Paanch as Radhika, a bespectacled teenager. After the series ended, Vidya refused director Anurag Basu's offer to star in a television soap opera, as she wanted to concentrate on a film career. Her parents were supportive of the decision but encouraged her to complete her education first. She then studied at St. Xavier's College, Mumbai, to pursue a bachelor's degree in sociology and later earned a master's degree from the University of Mumbai.

While pursuing her master's degree, Vidya was cast as the female lead in the Malayalam film Chakram, opposite Mohanlal and was subsequently signed on for 12 other Malayalam language films. However, due to production difficulties, Chakram was shelved. The postponement of a film starring Mohanlal was an unheard occurrence in Malayalam cinema and producers blamed Vidya for bringing "bad luck" to the project; labelled her as a "jinx"; and replaced her in the films that she had been contracted for. She shifted focus to Tamil cinema. In 2001, she was cast as the female lead in N. Linguswamy's Run (2002), opposite R. Madhavan. However, after completing the first shooting schedule, she was unceremoniously dropped and replaced by Meera Jasmine. She was signed up under false pretences for a sex comedy, a genre she was uncomfortable with, and decided to leave the project. She was again replaced by Meera Jasmine in Bala (2002). Thereafter, she signed on for a third Tamil film, Manasellam (2003), but was replaced by Trisha as the director was dissatisfied with her work. Kalari Vikraman, another Malayalam film that she completed work for in 2003, failed to get a theatrical release. After failing to start a film career, Vidya appeared in approximately 60 television commercials and in music videos for Euphoria and Shubha Mudgal; a majority of these were directed by Pradeep Sarkar.

Vidya's film debut came with the Bengali film Bhalo Theko (2003), a drama directed by Goutam Halder. He cast her in the central role of Aanandi, a young woman reminiscing about her past, for the combination of innocence and experience that he found in her. Vidya was ecstatic about her involvement in Bengali cinema, later calling it a dream come true and highlighting its contribution to her subsequent progress. She was awarded an Anandalok Purashkar for Best Actress for her performance. On Pradeep Sarkar's recommendation, Vidya auditioned for the lead role in his directorial venture—the Hindi film Parineeta (2005). The film's producer Vidhu Vinod Chopra initially preferred an established actress in the part, but agreed to cast Vidya after she underwent six months of extensive tests. Based on Sarat Chandra Chattopadhyay's 1914 Bengali novel of the same name, Parineeta tells the love story between Shekhar (played by Saif Ali Khan), the son of the local zamindar, and Lalita (Vidya), the dignified daughter of the family's tenant. Vidya's performance received praise from critics; Derek Elley of Variety found her to be an "acting revelation", adding that her "devoted but dignified Lalita is the picture's heart and soul". At the annual Filmfare Awards ceremony, she won Best Female Debut and received a nomination for Best Actress.