James P. Starlin (born October 9, 1949) is an American comics artist and writer. Beginning his career in the early 1970s, he is best known for space opera stories, for revamping the Marvel Comics characters Captain Marvel and Adam Warlock, and for creating or co-creating the Marvel characters Thanos, Drax the Destroyer, Gamora, and Shang-Chi. Starlin wrote the miniseries The Infinity Gauntlet and its many sequels including The Infinity War and The Infinity Crusade, all detailing Thanos's pursuit of the Infinity Gems and his conflict with the heroes of the Marvel Universe.

For DC Comics, he drew many iconic characters, including Darkseid, and wrote the seminal storyline A Death in the Family which featured the death of Jason Todd, the second Robin, during his run on Batman. For Epic Illustrated, he created his own character, Dreadstar.

Jim Starlin was born on October 9, 1949, in Detroit, Michigan. He had a Catholic upbringing. In the 1960s, Starlin served as an aviation photographer in the US Navy in Vietnam. During his off duty time, he drew and submitted various comics.

After leaving the navy, Starlin sold two stories to DC Comics.

After writing and drawing stories for a number of fan publications, Jim Starlin entered the comics industry in 1972, working for Roy Thomas and John Romita at Marvel Comics. Starlin was part of the generation of artists and writers who grew up as fans of Silver Age Marvel Comics. At a Steve Ditko-focused panel at the 2008 Comic-Con International, Starlin said, "Everything I learned about storytelling was [due to] him or Kirby. [Ditko] did the best layouts."

Starlin's first job for Marvel was as a finisher on pages of The Amazing Spider-Man. He then drew three issues of Iron Man which introduced the characters Thanos and Drax the Destroyer. He was then given the chance to draw an issue (#25) of the "cosmic" title Captain Marvel. Starlin took over as plotter the following issue, and began developing an elaborate story arc centered on the villainous Thanos which spread across a number of Marvel titles. Starlin left Captain Marvel one issue after concluding his Thanos saga.

Concurrently in the mid-1970s, Starlin contributed a cache of stories to the independently published science-fiction anthology Star Reach. Here he developed his ideas of God, death, and infinity, free of the restrictions of mainstream comics publishers' self-censorship arm, the Comics Code Authority. Starlin also drew "The Secret of Skull River", inked by frequent collaborator Al Milgrom, for Savage Tales #5 (July 1974).

After working on Captain Marvel, Starlin and writer Steve Englehart co-created the character Shang-Chi, Master of Kung Fu, though they only worked on the early issues of the Master of Kung Fu series. Starlin then took over the title Warlock, starring a genetically engineered being created by Stan Lee and Jack Kirby in the 1960s and re-imagined by Roy Thomas and Gil Kane in the 1970s as a Jesus Christ-like figure on an alternate Earth. Envisioning the character as philosophical and existentially tortured, Starlin wrote and drew a complex space opera with theological and psychological themes. Warlock confronted the militaristic Universal Church of Truth, eventually revealed to be created and led by an evil evolution of his future–past self, known as Magus. Starlin ultimately incorporated Thanos into this story. Comics historian Les Daniels noted that "In a brief stint with Marvel, which included work on two characters [Captain Marvel and Adam Warlock] that had previously never quite made their mark, Starlin managed to build a considerable cult following."