Raaz (transl. Secret) is a 2002 Indian supernatural horror film directed by Vikram Bhatt. The film stars Dino Morea and Bipasha Basu in lead roles, with Malini Sharma and Ashutosh Rana in supporting roles. The story follows Aditya and Sanjana who are a couple and have moved to Ooty to save their failing marriage. However, what they find in their new home is more than they expected when a ghost starts haunting the place. The wife (Sanjana) soon realises that her husband (Aditya) is part of a ghostly and scary conspiracy, which she must solve to restore their relationship. The film is an unofficial adaptation of the American film What Lies Beneath (2000).

It was the second-highest-grossing film of the year 2002 being the most profitable venture and the first instalment in the Raaz series. Basu's performance was highly praised and earned her a Best Actress nomination at the 48th Filmfare Awards. Nadeem-Shravan's music also earned them several Filmfare Award nominations. American entertainment publication Collider has considered it better than the original.

The film was shot in places across Ooty including The Lawrence School, Lovedale. The voices for the leading cast were dubbed by professional artists; Mona Ghosh Shetty dubbed for Basu, Namrata Sawhney dubbed for Sharma, and Bhatt himself dubbed for Morea.

A spiritual sequel to the film was released on 23 January 2009, under the title Raaz: The Mystery Continues and the third installment of the series titled Raaz 3 was released in 3D on 7 September 2012. A fourth film, Raaz Reboot, was released on 16 September 2016.