The Kamen Rider Series , also known as Masked Rider Series, is a Japanese superhero media franchise consisting of tokusatsu television programs, films, manga, and anime, created by manga artist Shotaro Ishinomori. Kamen Rider media generally features a motorcycle-riding superhero with an insect motif who fights supervillains, often known as kaijin .

Kamen Rider Decade is the title of the first installment of the 2009 editions of the long-running Kamen Rider Series of tokusatsu dramas. Decade, as its title suggests, is the tenth of the Heisei Rider special anniversary Series, having begun with Kamen Rider Kuuga, it was also the final installment of the Heisei era's first phase. It began broadcasting the week following the finale of Kamen Rider Kiva and was featured in Super Hero Time alongside the 2009 edition of the Super Sentai Series, Samurai Sentai Shinkenger. Kamen Rider Zi-O, the last Heisei era series of 2018-2019, acts as a spiritual sequel, where both Decade and Diend play prominent roles as re-occurring side characters who are directly involved in that series plotline.