James Tiberius "Jim" Kirk is a fictional character in the Star Trek franchise. Kirk first appears in "Star Trek: . As the captain of the Starship USS Enterprise, Kirk leads his crew as they explore "new worlds, where no man has gone before". Often, the characters of Spock and Leonard McCoy act as his logical and emotional sounding boards, respectively.

James Tiberius Kirk was born in Riverside, Iowa,] where he was raised by his parents, George and Winona Kirk. Although born on Earth, Kirk lived for a time on Tarsus IV, where he was one of nine surviving witnesses to the massacre of 4,000 colonists by Kodos the Executioner. James Kirk's brother, George Samuel Kirk, is first mentioned in "What Are Little Girls Made Of?" and introduced and killed in "Operation: Annihilate!", leaving behind three children.

Kirk became the first and only student at Starfleet Academy to defeat the Kobayashi Maru test, garnering a commendation for original thinking for reprogramming the computer to make the "no-win scenario" winnable. Kirk was granted a field commission as an ensign and posted to advanced training aboard the USS Republic. He was then promoted to lieutenant junior grade and returned to Starfleet Academy as a student instructor.

Kirk became Starfleet's youngest captain after receiving command of the USS Enterprise for a five-year mission, three years of which are depicted in the original Star Trek series.

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