1: Nenokkadine (transl. 1: I am alone) is a 2014 Indian Telugu-language psychological action thriller film directed by Sukumar. Produced by 14 Reels Entertainment and distributed by Eros International, the film stars Mahesh Babu and Kriti Sanon (in her film debut) in lead roles. Nassar, Pradeep Rawat, and Kelly Dorji appear in supporting roles. The story follows Gautham, a rock musician suffering from schizophrenia and missing 25 percent of his brain's grey matter, as he embarks on a quest to find his parents with the help of his girlfriend, Sameera, a journalist.

Sukumar began working on the film's script after completing 100% Love (2011), using a bus driver's tale about a boy claiming his parents were murdered on his bus as the foundation. 1: Nenokkadine features cinematography by R. Rathnavelu and editing by Karthika Srinivas. The music was composed by Devi Sri Prasad. Principal photography commenced in April 2012 and concluded in October 2013. Filming took place in various locations including London, Belfast, Bangkok, and Indian cities such as Hyderabad, Mumbai, Goa, Chennai, and Bangalore. Produced on a budget of ₹60–70 crore, it was the most expensive Telugu film at the time of its release.

1: Nenokkadine was released on 10 January 2014 across approximately 1,500 screens during the Sankranti festival season. The film received mixed reviews, with praise directed towards its music, cinematography, action sequences, and Mahesh Babu's performance. However, the complexity of the screenplay and its length garnered criticism. The film eventually became a box office failure. It won three awards from eight nominations at the 4th SIIMA Awards and two awards at the 11th CineMAA Awards. Over time, the film was reevaluated and gained a cult following for its unique narrative and technical finesse. It was also listed among Film Companions "25 Greatest Telugu Films of the Decade."