Saif Ali Khan (born August 16, 1970 in New Delhi, India) is an Indian actor in Bollywood films. He is the son of the Nawab of Pataudi, Mansoor Ali Khan Pataudi, and the actress Sharmila Tagore. He has two sisters; actress Saba Ali Khan and Soha Ali Khan. He is the heir apparent to the headships of both the royal houses of Bhopal and Pataudi.

Khan made his debut in 1992 with Parampara. He had his first major successes with the 1994 films Main Khiladi Tu Anari and Yeh Dillagi. After going through several years of decline in the 1990s, he rose into prominence with his performance in Dil Chahta Hai (2001), which marked his professional turning point. His performance in Nikhil Advani's Kal Ho Naa Ho (2003) won him the Filmfare Best Supporting Actor Award, and he won the National Film Award for Best Actor for his performance in Hum Tum (2004). He then had commercial success with films like Salaam Namaste (2005) and Ta Ra Rum Pum (2007), and starred in critically acclaimed projects such as Parineeta (2005) and Omkara (2006). These successes put him among the most successful actors in the industry. Since 2009, Khan has branched out into film production. He is the founder-owner of his production company Illuminati Films.

Saif Ali Khan was born into a Muslim Pathan family of the Nawabs of Pataudi. His paternal grandfather, Iftikhar Ali Khan Pataudi, was the Nawab of Pataudi as well as an accomplished cricketer who played for England and then for India as the captain of the team. His paternal grandmother was Sajida Sultan, Begum of Bhopal and his great-uncle was Pakistani general Nawabzada Sher Ali Khan Pataudi. His father is Mansoor Ali Khan Pataudi, the eighth Nawab of Pataudi and a former captain of the Indian cricket team. Khan has two sisters Saba Ali Khan and Soha Ali Khan. Khan's mother is Sharmila Tagore a Bengali Indian film actress and a member of Bengal's Tagore Family. She is also the head of the Indian film censorship board and a relative of the Nobel laureate - Rabindranath Tagore. Sharmila Tagore converted to Islam from Hinduism after her marriage to Khan's father, and changed her name to Begum Ayesha Sultana. Khan spent his childhood in a Muslim atmosphere, reading the Quran, with his grandmother being the center of his religious education. Khan says that "Religion played a major role in my upbringing."

Initially Khan studied at the Lawrence School Sanawar but later attended Lockers Park Prep School. Later, he followed in his father's footsteps by attending Winchester College, a famous independent school for boys in UK. Khan can speak his native languages of Hindi, and Bengali fluently, as well as English.

In 1993, he won the Filmfare Best Male Debut Award for Aashiq Awara. His breakthrough role came in 1994 with Yeh Dillagi starring opposite Kajol and Akshay Kumar which was his first major hit. Khan went on to star in many films but they failed at the box office. He only had success with multi-starrer hits like Main Khiladi Tu Anari (1994), Imtihaan (1995), Kachche Dhaage (1999) and Hum Saath-Saath Hain: We Stand United (1999). After some box office failures he had a hit with the film Kya Kehna (2000).

His acting career, more or less, went through a relative slump until 2001, when he was cast in Farhan Akhtar's contemporary drama Dil Chahta Hai. He received much acclaim for his role as Sameer with critic Taran Adarsh calling it his career-best performance. The success of this film firmly established Saif as one of the industry's most bankable stars.

He has since had many box office successes, starting with Nikhil Advani's drama Kal Ho Na Ho (2003), co-starring alongside Shahrukh Khan and Preity Zinta. The film, set in New York, starred Saif as Rohit, Zinta's best friend, who later realises that he loves her. The film was the second top-grossing film of the year, and Khan's performance was praised by critics. He won the Filmfare Best Supporting Actor Award, as well as other awards in that category in other award ceremonies. Khan followed it with the leading role in Kunal Kohli's romantic comedy Hum Tum (2004), his first collaboration with Yash Raj Films. The film follows the encounters of the two main characters until they, after several years and various meetings, become friends and finally fall in love. Khan played the role of Karan Kapoor, a young cartoonist and womaniser whose relationship with Rhea Prakash, played by Rani Mukerji, changes his perception of women and life. Khan's performance was applauded by both critics and audiences. He won the Best Comedian award at the Filmfare, and was conferred the coveted National Film Award for Best Actor in 2005. Khan's next project with the Yash Raj Films production, Salaam Namaste (2005), became India's top-grossing film in the overseas market. The film, which was the first Indian film to be entirely shot in Australia, starred Khan and Preity Zinta as a contemporary cohabiting Indian couple. He was also noted for his performance in a negative role in Ram Gopal Verma's Ek Hasina Thi (2004) and for his role of Shekhar Rai in Pradeep Sarkar's Parineeta (2005), an adaptation of the 1914 Bengali novella, Parineeta by Sarat Chandra Chattopadhyay.

In 2006 Khan played the protagonist in the English-language art film, Being Cyrus. His role as Cyrus got him positive reviews. In that same year, he went on to receive major acclaim for his portrayal of lago in the Indian adaptation of Shakespeare's Othello, Omkara. Rediff.com stated, "Omkara marks Saif's emergence into the very forefront of his acting peers, and we gleefully applaud". Variety film critic Derek Elley called his performance "powerhouse" and further wrote, "It's Khan's movie through and through, in a performance of rugged, contained malevolence which trades on his previous screen persona as a likable best friend as well as his stint as the manipulative outsider in 'Being Cyrus'. It's smart casting, superbly realized." For his work, Khan earned the awards for Best Actor in a negative role at the Star Screen, Filmfare, Zee Cine and IIFA Awards.

Khan next acted in Eklavya: The Royal Guard (2007), co-starring alongside his mother for the second time since Aashiq Awara (1993). The film was India's official entry to the Oscars, and Khan's performance as Harshwardhan was appreciated by critics. Taran Adarsh commented, "watching him emote with amazing precision makes you realise the giant strides he has taken as an actor". He next appeared alongside Rani Mukerji in the family drama, Ta Ra Rum Pum (2007). Directed by Siddharth Anand, the film went on to become a box office success.

Khan with Kareena Kapoor at the 53rd Annual Filmfare Awards (2008).

Khan married actress Amrita Singh in October 1991. After thirteen years of marriage and two children, the couple divorced in 2004. His children live with their mother.

In 1998, Khan was charged with poaching two blackbucks in Kankani during the filming of Hum Saath Saath Hain along with co-stars Salman Khan, Tabu, Sonali Bendre and Neelam. The charges were dropped soon after Khan was acquitted.

On February 18, 2007, Khan was hospitalised at Lilavati Hospital, Mumbai due to experiencing chest pain while rehearsing for his performance at the Stardust Awards, to be held that night. After hospitalization, he stated he would quit smoking.

In 2005, along with other Bollywood stars, Khan performed at the HELP! Telethon Concert to help raise money for the victims of the 2004 Indian Ocean earthquake.

Khan took part in two major world tours. He was part of a troupe that included Shahrukh Khan, Rani Mukerji, Preity Zinta, Arjun Rampal and Priyanka Chopra, which went on the Temptations 2004 world tour.

In 2006, Khan toured again, participating and performing in Heat 2006 concert around the world, along with Akshay Kumar, Preity Zinta, Sushmita Sen and Celina Jaitley.

In 2006, Khan appeared along with various other Bollywood actors at the Closing Ceremony of the 2006 Commonwealth Games in Melbourne, as part of a performance showcasing Indian culture along with Rani Mukerji, and Aishwarya Rai on behalf of the 2010 Commonwealth Games, to be held in Delhi.

In 2008, Khan first starred in the Abbas-Mustan thriller Race, which went on to do well at the box office. This was followed by two projects produced by Yash Raj Films, Tashan and Thoda Pyaar Thoda Magic, both of which were not successful.

In 2009 Khan produced and starred in Love Aaj Kal. The film, directed by Imtiaz Ali, was a critical and commercial success.

Khan turned Producer when he setup his production company called Illuminati Films in 2009. His first film Love Aaj Kal starring Deepika Padukone as a female lead opposite him and directed by Imtiaz Ali was critically and commercially successful. Saif’s second film production titled as Agent Vinod, will be directed by Sriram Raghavan. Both films will be made by Saif's production company and will see a UK release by Eros International based in London. Saif working with Rensil D Silva opposite Kareena Kapoor in Kurbaan.