Doki Doki is the Japanese onomatopoeia that refers to the sound of a heart beating. There are several works which use this word including:
- The manga Ane Doki.
- The web video Doki Doki Awesome.
- The webcomic DokiDoki CheckMate.
- The visual novel Doki Doki Literature Club!
- The video game Doki Doki Panic, which was the inspiration towards Super Mario Bros. 2.
- The anime series DokiDoki! PreCure.
- The manga/anime series Doki Doki School Hours.
- The video game Doki-Doki Universe.
- The fan video Koishi Komeiji's Heart-Throbbing Adventure.