Ponniyin Selvan: I (PS-1, transl. The Son of Ponni) is a 2022 Indian Tamil-language epic action drama film directed by Mani Ratnam, who co-wrote it with Elango Kumaravel and B. Jeyamohan. Produced by Ratnam and Subaskaran Allirajah under Madras Talkies and Lyca Productions, it is the first of two cinematic parts based on Kalki Krishnamurthy's 1955 novel, Ponniyin Selvan. The film stars an ensemble cast including Vikram, Karthi, Jayam Ravi, Aishwarya Rai Bachchan, Trisha, Jayaram, Aishwarya Lekshmi, Sobhita Dhulipala, Prakash Raj, Prabhu, R. Sarathkumar, R. Parthiban, Rahman, Lal and Vikram Prabhu. The music was composed by A. R. Rahman, with cinematography by Ravi Varman, editing by A. Sreekar Prasad, and production design by Thota Tharani. Ponniyin Selvan: I dramatises the early life of Chola prince Arunmozhi Varman, who would become the renowned emperor Rajaraja I (947–1014). In the film, Vandiyathevan sets out to cross the Chola land to deliver a message from the crown prince Aditha Karikalan. Meanwhile, Kundavai attempts to establish political peace as vassals and petty chieftains plot against the throne.

Ever since its publication, a film adaptation of the novel Ponniyin Selvan had been explored by several Tamil filmmakers, including an attempt by M. G. Ramachandran in the late 1950s; however, it never materialised. Decades later, Ratnam attempted to adapt the novel in the late-1980s and early-2010s but was unsuccessful due to financial constraints. He eventually managed to revive the effort in January 2019, after Lyca agreed to fund the film. Following several changes in cast and crew, production of Ponniyin Selvan began in December 2019 and concluded in September 2021, halting twice due to the COVID-19 pandemic. The film was shot in various locations across India, with a few sequences in Thailand. It was originally intended to be a single film but was split into two parts.

Ponniyin Selvan: I was released in theatres worldwide on 30 September 2022 in standard and IMAX formats. Ponniyin Selvan: I met with critical acclaim, with emphasis on the direction, musical score, technical aspects, and the cast's performances (with some reviews praising Vikram, Karthi, Jayam Ravi, Aishwarya Rai Bachchan, Trisha, Jayaram and entire cast performances).The film grossed ₹450–500 crore worldwide, becoming the highest-grossing Tamil film of 2022, third-highest-grossing Indian film of 2022. The film is currently the fourth highest-grossing Tamil film of all time. The film received six nominations at the 16th Asian Film Awards, including Best Film. It won the Best Tamil film award at the 68th Filmfare Awards. The film also won 4 National Awards, in the 70th National Awards, announced on 16th August, 2024, including the best film.