Harry Potter

Harry Potter is a book series spanning 7 main books and about 100~ secondary publications. Moreover, the series has spawned 11 films and counting, several video games and countless pieces of media. It has been referenced a handful of times throughout My Little Pony.

In-universe

 * Harry Potter, Ron Weasley, Hermione Granger, Severus Snape, Voldemort, Lucius Malfoy, Narcissa Malfoy, Minerva McGonagall and Sybill Trelawney have all appeared as characters in the comics.
 * Professor Flintheart may be a reference to Severous Snape as well.

Homages

 * Buckbeak is the name of a town in Land of the Hippogriffs. It is also the name of the Hippogriff who debuted in Harry Potter and the Prisoner of Azkaban
 * FanExpo variant cover features cosplaying as Harry Potter the character.
 * Clayton Potter is believed to be based off Harry Potter visually.

Other connections

 * MAD and Robot Chicken have both parodied Harry Potter, as well as My Little Pony.
 * Harry Potter appeared in an early episode of DEATH BATTLE, which has since featured three My Little Pony fighters and coincidentally has also had cast member Jason Michas before he appeared in Equestria Girls.
 * Gurihiru has produced artwork for Harry Potter.
 * Víctor Hugo Aguilar portrayed Hagrid in the Mexican dub of the Harry Potter films.
 * Akira Ishida portrayed Lord Voldermort in the Japanese dub of Harry Potter and the Chamber of Secrets.