| Work | Description | Characters |
|---|---|---|
| Iron Man | American animated television series from 1994–1996 | 1 |
| Iron Man 2 | 2010 superhero film directed by Jon Favreau | 4 |
| Iron Man 3 | 2013 superhero film produced by Marvel Studios | 5 |
| Iron Man: Armored Adventures | 2009 French animated series | 2 |
| Iron Man: Rise of Technovore | 2013 film | 1 |
| Isaiah | book of the Bible | 3 |
| Isaiah 9 | Book of Isaiah, chapter 9 | 1 |
| Isekai Quartet | 2019 crossover anime featuring characters from Kadokawa Corporation | 3 |
| Ishmael | novel by Barbara Hambly | 4 |
| Is It College Yet? | 2002 television film | 1 |
| Is It Fall Yet? | 2000 television film directed by Karen Disher | 1 |
| Is It Wrong to Try to Pick Up Girls in a Dungeon? | Japanese anime television series | 1 |
| Is It Wrong to Try to Pick Up Girls in a Dungeon? | Japanese manga series | 1 |
| Is It Wrong to Try to Pick Up Girls in a Dungeon? | Japanese light novel series | 1 |
| Is It Wrong to Try to Pick Up Girls in a Dungeon? On the Side: Sword Oratoria | Japanese light novel series | 1 |
| Is My Palm Read | 1933 film by Dave Fleischer | 1 |
| Israel in Egypt | oratorio by Georg Friedrich Händel | 1 |
| iSteve | 2013 parody film directed by Ryan Perez | 4 |
| Is There in Truth No Beauty? | episode of Star Trek: The Original Series (S3 E5) | 7 |
| It | novel by Stephen King | 1 |
| It | 2017 supernatural horror film directed by Andy Muschietti and based on a novel by Stephen King | 1 |
| It | 1990 psychological slasher/drama series directed by Tommy Lee Wallace | 1 |
| It: Chapter Two | 2019 supernatural horror film by Andy Muschietti | 1 |
| It's a Bird...It's a Plane...It's Superman | 1966 musical | 1 |
| It's Always Sunny in Philadelphia | American comedy television series | 6 |
| It's Okay to Not Be Okay | 2020 South Korean television series | 3 |
| I Want to Eat Your Pancreas | 2018 Japanese animated film directed by Shinichiro Ushijima | 2 |
| Iwein | Middle High German Arthurian romance by Hartmann von Aue | 2 |
| Ixion Saga DT | Japanese anime television series based on the online game Ixion Saga by Capcom | 1 |
| Jack-Jack Attack | 2005 film by Brad Bird | 1 |
| Jack Reacher | 2012 film by Christopher McQuarrie | 1 |
| Jack Reacher | book series | 1 |
| Jack Ryan film series | 1990-2014 series of films featuring the Tom Clancy character Jack Ryan | 1 |
| Jack Strong | 2014 film directed by Władysław Pasikowski | 1 |
| Jak 3 | 2004 platforming video game | 3 |
| Jak and Daxter: The Lost Frontier | video game | 3 |
| Jak and Daxter: The Precursor Legacy | 2001 video game | 3 |
| Jak II | 2003 video game | 3 |
| Jak X: Combat Racing | 2005 video game | 3 |
| Jane Eyre | novel by English writer Charlotte Brontë | 1 |
| Jason Bourne | 2016 film by Paul Greengrass | 1 |
| Jay and Silent Bob Strike Back | 2001 film directed by Kevin Smith | 1 |
| Jaynestown | episode of Firefly (S1 E7) | 1 |
| Jedi vs. Sith | 1 | |
| Jellystone! | TV series | 1 |
| Jennifer's Body | 2009 film by Karyn Kusama | 1 |
| Jeremiah | book of the Bible | 4 |
| Jessica Jones | American web television series | 1 |
| Jesus Christ Superstar | 1973 film adaptation of the musical of the same name directed by Norman Jewison | 1 |
| Jesus Christ Superstar | rock opera by Andrew Lloyd Webber and Tim Rice | 1 |
| Jesus Christus | Lutheran hymn | 1 |
| Jesus Christus, unser Heiland, der den Tod überwand | 1524 sacred Song | 1 |
| Jesus Met the Woman at the Well | song performed by Peter, Paul and Mary | 1 |
| Jigoku Sensei Nūbē | 2025 Japanese anime television series | 1 |
| Jigoku Sensei Nūbē | 1996 Japanese anime television series | 2 |
| Jigoku Sensei Nūbē | Japanese manga series | 2 |
| Jimmy Neutron: Boy Genius | 2001 animated film directed by John A. Davis | 1 |
| Jimmy Neutron: Boy Genius Shorts | animated microseries for Nickelodeon | 1 |
| Jimmy Neutron: Boy Genius (video game) | 2001 video game | 1 |
| Jimmy Neutron vs. Jimmy Negatron | 2002 video game | 1 |
| JLA Adventures: Trapped in Time | 2014 film by Giancarlo Volpe | 5 |
| JLA: Earth 2 | graphic novel written by Grant Morrison | 1 |
| Joanie Loves Chachi | American Television Show | 1 |
| Joan of Arcadia | television series | 1 |
| Joey | American sitcom | 1 |
| John Carter | 2012 American science fiction adventure film directed by Andrew Stanton | 1 |
| Johnny Bravo | American animated television series | 1 |
| John Wick | film franchise | 1 |
| John Wick | 2014 American action thriller film directed by David Leitch | 1 |
| John Wick: Chapter 2 | 2017 American action thriller film directed by Chad Stahelski | 1 |
| John Wick: Chapter 3 – Parabellum | 2019 film directed by Chad Stahelski | 1 |
| JoJo's Bizarre Adventure | Japanese manga and anime series | 11 |
| Joker | 2019 film by Todd Phillips | 2 |
| Joker Game | Japanese novel series | 1 |
| Jolly Old Saint Nicholas | song performed by Chicago | 1 |
| Jon | comic strip | 1 |
| Joshua | sixth book of the Bible | 1 |
| Journey's End | episode of Star Trek: The Next Generation (S7 E20) | 7 |
| Journey to the West | 1996 Hong Kong television series | 1 |
| Journey to the West | 2010 Chinese television series | 1 |
| Journey to the West | 1986 Chinese television series | 4 |
| Journey to the West | One of China's Four Great Classical Novels | 4 |
| Journey to the West | 2011 Chinese TV series | 1 |
| Journey to the West: Conquering the Demons | 2013 film by Stephen Chow, Derek Kwok | 2 |
| Journey to the West II | 1998 Hong Kong television series | 1 |
| Journey to the West: The Demons Strike Back | 2017 film by Tsui Hark | 1 |
| Judge for a Day | 1935 film by Dave Fleischer | 1 |
| Judges | seventh book of the Bible | 1 |
| Jujutsu Kaisen | Japanese manga series | 14 |
| Jujutsu Kaisen | Japanese anime television series | 13 |
| Jujutsu Kaisen 0 | Japanese manga series | 1 |
| Julian | 1964 novel by Gore Vidal | 1 |
| Jump Force | 2019 video game | 14 |
| Jupiter's Legacy | 2021 American superhero television series. | 1 |
| Jurassic Park | 1993 American science fiction adventure film directed by Steven Spielberg | 2 |
| Jurassic Park | novel by Michael Crichton | 2 |
| Jurassic Park III | 2001 US science fiction-adventure film directed by Joe Johnston | 1 |
| Jurassic World: Fallen Kingdom | 2018 5th Jurassic Park film directed by Juan Antonio Bayona | 1 |
| Justice League | US 2001-2004 animated television series | 8 |
| Justice League | 2017 American superhero film directed by Zack Snyder | 15 |