The Futurama episode "Game of Tones" has the Planet Express crew entering Fry's subconscious so he can remember where he heard a planet destroying sound from previously, back on December 31, 1999, the day he was frozen.
In the Gravity Falls episode "Dreamscaperers", Dipper recites an incantation to enter Grunkle Stan's mind, part of which in Faux Latin is "Nolanus inceptus overratus".
The Phineas and Ferb episode "Monster from the Id" has the gang enter Candace's brain to help her remember the gift she lost from Jeremy.
The episode 2 of the first season of Rick and Morty features a subplot inspired by the movie.
In a season 6 episode of Teen Titans Go!, the Titans jump into a painting, and when they are about to jump into another painting, Cyborg points out that it's like Inception.
In Old School RuneScape, one of the spells in the Lunar Spellbook is Dream, which causes your character to fall asleep and restore their health at a faster rate. One place in the game is the Nightmare Zone, which is set inside a dream. Casting Dream inside the Nightmare Zone will yield a message that states you can't perform Inception.
