Ajab Prem Ki Ghazab Kahani (transl. An Amazing Story of a Strange Prem) is a 2009 Indian Hindi-language romantic comedy written and directed by Rajkumar Santoshi, based on a script written in conjunction with Rajesh Tailang and a story written in conjunction with K. Rajeshwar, and produced by Ramesh S. Taurani under the Tips Industries Limited banner. It stars Ranbir Kapoor and Katrina Kaif in lead roles, with Smita Jaykar, Darshan Jariwala, Upen Patel, Govind Namdev, Dolly Bindra, Mithilesh Chaturvedi, Navneet Nishan, Zakir Hussain and Rana Jung Bahadur in supporting roles, with Salman Khan in a special appearance.

Upon release, Ajab Prem Ki Ghazab Kahani emerged as a commercial success, grossing ₹103.21 crore worldwide, becoming the third-highest grossing Hindi film of the year. The film received positive reviews from critics, with praise for its direction, story, screenplay, dialogues, soundtrack, and performances of the cast.

At the 55th Filmfare Awards, Ajab Prem Ki Ghazab Kahani received 5 nominations, including Best Actor (Kapoor) and Best Music Director (Pritam), and won Best Actor (Critics) (Kapoor).