Last Updated on 6 July 2025
Here is a list of holidays related to different fandoms. If you're a fan and know of more that I should add, please suggestions@listobsession.com.
- Jan 2 - Science Fiction Day
- Jan 3 - J.R.R. Tolkien Day
- Jan 13 - Rubber Ducky Day
- Jan 17 - Popeye Day
- Jan 28 - Lego Day
- Feb 1 - G.I. Joe Day
- Feb 23 - Pinocchio Day
- Feb 27 - Pokémon Day
- Feb 29 - Superman's Birthday
- Mar 4 - Toy Soldier Day
- Mar 7 - Sock Monkey Day
- Mar 8 - Retro Video Game Day
- Mar 9 - Barbie Day
- Mar 10 - Mario Day
- Mar 13 - Ken Doll Day
- Mar 20 - Hufflepuff Pride Day
- Mar 20 - Won't You Be My Neighbor Day
- Mar 21 - Slytherin Pride Day
- Mar 22 - Gryffindor Pride Day
- Mar 23 - Ravenclaw Pride Day
- Mar 25 - Tolkien Reading Day
- Mar 26 - Live Long and Prosper Day
- Mar 31 - Crayon Day
- Apr 3 - Fish Fingers and Custard Day
- Apr 5 - Star Trek First Contact Day
- Apr 9 - Jumbo the Elephant Day
- Apr 9 - Unicorn Day
- Apr 15 - Anime Day
- Apr 18 - Superman Comic Day
- Apr 18 - World Marbles Day
- Apr 19 - Sylvester the Cat Day
- Apr 23 - Impossible Astronaut Day
- Apr 24 - International Firefly Day
- Apr 26 - Alien Day
- Apr 27 - Woody Woodpecker Day
- Apr 28 - Superhero Day
- Apr 30 - Bugs Bunny Day
- Apr 30 - Mr. Potato Head Day
- May 1 - Mother Goose Day
- May 2 - Harry Potter Battle of Hogwarts Day
- May 4 - Intergalactic Star Wars Day
- May 7 - Black Spot Day
- May 11 - Twilight Zone Day
- May 13 - Leprechaun Day
- May 21 - Talk Like Yoda Day
- May 22 - Sherlock Holmes Day
- May 22 - World Goth Day
- May 25 - Geek Pride Day
- May 26 - World Dracula Day
- Jun 1 - Oscar the Grouch Day
- Jun 1 - World Outlander Day
- Jun 3 - Wonder Woman Day
- Jun 6 - Yo-Yo Day
- Jun 8 - Ghostbusters Day
- Jun 9 - Donald Duck Day
- Jun 12 - Raggedy Ann and Andy Day
- Jun 12 - Superman Day
- Jun 19 - Garfield the Cat Day
- Jun 21 - Mermaid Day
- Jun 25 - Smurfs Day
- Jun 26 - 626 Day (Lilo & Stitch Day)
- Jul 4 - Alice in Wonderland Day
- Jul 10 - Teddy Bear Picnic Day
- Jul 17 - Disneyland Day
- Jul 17 - World Emoji Day
- Jul 27 - Dungeons & Dragons Day
- Jul 31 - International Harry Potter Day
- Aug 1 - Spiderman Day
- Aug 6 - Sailor Moon Day
- Aug 10 - Snoopy’s Birthday
- Aug 12 - Vinyl Record Day
- Aug 28 - Power Rangers Day
- Aug 30 - Slinky Day
- Sep 8 - Star Trek Day
- Sep 13 - Scooby-Doo Day
- Sep 13 - Supernatural Day
- Sep 13 - Twilighters Day
- Sep 16 - Play-doh Day
- Sep 21 - Batman Day
- Sep 22 - Hobbit Day
- Sep 25 - Comic Book Day
- Sep 30 - Thunderbirds Day
- Oct 1 - Willy Wonka Day
- Oct 3 - Mean Girls Day
- Oct 6 - Mad Hatter Day
- Oct 12 - Harry Potter Book Day
- Oct 15 - I Love Lucy Day
- Oct 21 - Back to the Future Day
- Nov 1 - Hello Kitty Day
- Nov 2 - Cookie Monster Day
- Nov 10 - Sesame Street Day
- Nov 18 - Mickey Mouse Day
- Nov 18 - Minnie Mouse Day
- Nov 18 - Princess Day
- Nov 23 - Doctor Who Day
- Dec 5 - Disney Day
- Dec 11 - Fandom Day
- Dec 28 - Marvel Day
