Anjaana Anjaani (transl. "Strangers") is a 2010 Indian Hindi-language romantic comedy-drama film directed by Siddharth Anand and produced by Sajid Nadiadwala. The film stars Priyanka Chopra and Ranbir Kapoor as two suicidal strangers who meet and make a pact to commit suicide in 20 days on New Year's Eve. In the interim, the couple fulfils their personal wishes and eventually falls in love. The soundtrack of the film, composed by Vishal–Shekhar and lyrics by various artists including the duo themselves, received widespread critical acclaim and was a major commercial success. The film was promoted with the tag-line "All The Greatest Love Stories Are Between Strangers."

Wanting to make an unusual romance film, Anand struggled to find unconventional ideas while he was writing. His wife, Mamta, then came up with the core narrative of the film, which excited him and changed his perspective. Anand approached novelist Advaita Kala who developed the story into a feature-length script, and later co-wrote the screenplay with him. Principal photography was done entirely in New York City, Las Vegas and San Francisco.

Made on a production and marketing budget of ₹380 million, Anjaana Anjaani was released on 1 October 2010, grossing over ₹698 million at the box office, thus emerging as a moderate commercial success. The film received mixed-to-positive reviews from critics, with praise for its novel concept, music, cinematography, humor, costumes and the leads' performances, but criticism for its screenplay and pacing. At the 56th Filmfare Awards, it received a nomination for Best Music Director for Vishal-Shekhar.

Anjaana Anjaani marks Anand's final romantic comedy drama film to date; he has since ventured into the action thriller genre, where he continues to be active. The film also marks his penultimate collaboration with Salim-Sulaiman, as well as his first with lyricist Kumaar, who would eventually become his and Vishal-Shekhar's regular collaborator on their future soundtracks together.