RWBY (pronounced "Ruby") is an American animated web series created by Monty Oum for Rooster Teeth. It is set in the fictional world of Remnant, where young people train to become warriors ("Huntsmen" and "Huntresses") to protect their world from monsters called Grimm. The name RWBY is derived from the four main protagonists' forenames: Ruby Rose, Weiss Schnee, Blake Belladonna and Yang Xiao Long, and their respective thematic colors (red, white, black and yellow).

Following several promotional trailers, the first episode was screened at Rooster Teeth's convention, RTX, and premiered on their website on July 18, 2013. Subsequent episodes were released weekly, first to Rooster Teeth subscribers and then to YouTube a week later. Following Oum's death in 2015 during the production of the third season (stylized as volumes), there was an overall shift in the series production and release schedule. Despite the death of its creator, the remaining crew members confirmed their intention to continue the series. Following the eighth volume, the series was moved to Crunchyroll. Volume 9 premiered on Crunchyroll on February 18, 2023. In March 2024, with the announcement of Rooster Teeth's shutdown, plans were made to sell the IP rights to RWBY, among other Rooster Teeth properties. On July 5, 2024, Viz Media was announced to have acquired the RWBY IP.

RWBY earned acclaim, with praise going towards its animation and soundtrack; it became an instant viral hit after the airing of its pilot. The series has been dubbed in Japanese and broadcast by Tokyo MX, in partnership with Warner Bros. Japan, and has spawned several spin-off media, such as the video games RWBY: Grimm Eclipse and RWBY: Arrowfell, the animated series RWBY Chibi and RWBY: Ice Queendom and the two-part direct-to-video film Justice League x RWBY: Super Heroes & Huntsmen.