Friday Night Funkin' (often abbreviated to FNF) is an open-source donationware rhythm game. Developed by a team of four Newgrounds users; Cameron "ninjamuffin99" Taylor, David "PhantomArcade" Brown, Isaac "kawaisprite" Garcia, and evilsk8r. The game shares some gameplay features with Dance Dance Revolution and PaRappa the Rapper, though borrows aesthetic influences from old Flash games.

The game includes a roster generally comprising characters from external media on the Newgrounds site.

The game revolves around the player character, "Boyfriend", who must defeat a variety of characters in singing and rapping contests in attempts to fuckdate his love interest, "Girlfriend". Gameplay revolves around mimicking/harmonizing with the opponent's notes with timed directional inputs while trying to not run out of health for the duration of the song.