RWBY (/ˈruːbi/, like "ruby", an acronym of each of the four main characters' forenames: Ruby, Weiss, Blake, and Yang) is an American anime-style web series and media franchise created by Monty Oum for Rooster Teeth. The show is set in the fictional world of Remnant, where young people train to become Huntsmen and Huntresses to protect their world from the creatures of Grimm. Following several promotional trailers, the first episode was screened at RTX and then released on Rooster Teeth's website in July 2013. Subsequent episodes were released approximately weekly, first to Rooster Teeth's subscribers and then to YouTube a week later. The series became a viral hit, and a second season, subtitled Volume 2, was released in July 2014.

During production of Volume 3, on February 1, 2015, Oum died after falling into a coma that was caused by an allergic reaction during a medical procedure. This left the future of the series uncertain for a brief period of time until Rooster Teeth Animation Head Gray Haddock announced that the series would continue, and that Volume 3 would premiere in 2015 as planned. Volume 3 was released on October 24, 2015. Meanwhile, the first two seasons were released to home media and made available on streaming services such as Netflix and Crunchyroll, the latter of which would include releases of the current season in their simulcasts. In October 2016, the fourth season was released. The series has also been dubbed in Japan and broadcast by Tokyo MX, in partnership with Warner Bros. Japan.

Rooster Teeth released a video game called RWBY: Grimm Eclipse, as well as a spin-off series called RWBY Chibi, in 2016. The fifth volume premiered on October 14, 2017. Volume 5 teaser shorts for the characters Weiss Schnee, Blake Belladonna, and Yang Xiao Long were released, as well as a second season of RWBY Chibi.