The Karate Kid is a 1984 American martial arts drama film written by Robert Mark Kamen and directed by John G. Avildsen. It is the first installment in the Karate Kid franchise, and stars Ralph Macchio, Pat Morita, Elisabeth Shue, and William Zabka. The Karate Kid follows the story of Daniel LaRusso (Macchio), an Italian-American teenager from New Jersey who moves with his widowed mother to the Reseda neighborhood of Los Angeles. There, LaRusso encounters harassment from his new bullies, one of whom is Johnny Lawrence (Zabka), the ex-boyfriend of LaRusso's love interest, Ali Mills (Shue). LaRusso is taught karate by a handyman and war veteran named Mr. Miyagi (Morita) to help LaRusso defend himself and compete in a karate tournament against his bullies.

Kamen was approached by Columbia Pictures to compose a film similar to Avildsen's previous success Rocky (1976), after Columbia signed the director. Kamen drew inspiration from the real-life events of an eight-year-old Tum Pai student's story in Hawaii when writing the film. As a result, he maintained strong opinions regarding cast, and petitioned heavily for Morita's inclusion. Preparations for the film began immediately after the final edit of the script was complete, and casting took place between April and June 1983. Principal photography began on October 31, 1983, in Los Angeles and was completed by December 16. The film was Macchio's second major film role, following The Outsiders (1983).

The Karate Kid was theatrically released in the United States on June 22, 1984. The film received mostly positive reviews from critics, many of whom praised the action sequences, writing, themes, performances, and music. The film was also a commercial success, grossing over $130 million worldwide, making it one of the highest-grossing films of 1984 and Hollywood's biggest sleeper hit of the year. The film revitalized the acting career of Morita, who was previously known mostly for comedic roles, and it earned him a nomination for the Academy Award for Best Supporting Actor. The film subsequently launched a media franchise and is credited for popularizing karate in the United States.