Jason Voorhees is a fictional character from the Friday the 13th series. He first appeared in Friday the 13th (1980) as the young son of camp cook-turned-murderer, Mrs. Voorhees, in which Ari Lehman portrayed him. The character has subsequently been represented in various other media, including novels, comic books, and a crossover film with another iconic horror film character, Freddy Krueger. Unfortunately, the detail about his net worth and annual salary still lies in disguise from his fans all over the world.

It has been stated that the character has primarily been an antagonist in the films, whether by stalking and killing the other characters, or acting as a psychological threat to the protagonist, as is the case in Friday the 13th: A New Beginning. Since Lehman's portrayal, numerous actors and stuntmen have represented the character, sometimes by more than one at a time; this has caused some controversy as to who should receive credit for the portrayal. Kane Hodder is the best known of the stuntmen to portray Jason Voorhees, having played the character in four consecutive films.

The character's physical appearance has gone through many transformations, with various special makeup effects artists making their mark on the character's design, including makeup artist Stan Winston. Tom Savini's initial design has been the basis for many of the later incarnations. The trademark hockey goalie mask did not appear until Friday the 13th Part III. Since Friday the 13th Part VI: Jason Lives, filmmakers have given Jason superhuman strength, regenerative powers, and near invulnerability. He has been seen as a sympathetic character, whose motivation for killing has been cited as being driven by the immoral actions of his victims and his own rage over having drowned as a child.

On addition, Jason Voorhees has been featured in various humor magazines, referenced in feature films, parodied in television shows, and was the inspiration for a horror punk band. Several toy lines have been released based on various versions of the character from the Friday the 13th films. Jason Voorhees's hockey mask is a widely recognized image in popular culture.