The Imagin (イマジン, Imajin?) are a fictional race that serve as the antagonists in the Kamen Rider Series Kamen Rider Den-O. The name "Imagin" comes from several words in the English, Japanese, and even Arabic languages: "imagine" (イマジン, imajin?), "now" (今, ima?), "person" (人, jin?) and "djinn" (ジン, jin?).
The Imagin were designed by Yasushi Nirasawa (韮沢 靖, Nirasawa Yasushi?), who previously worked on the designs for the Undead in Kamen Rider Blade, the Horrors in GARO, and the Worms in Kamen Rider Kabuto. These designs are detailed in Imagin Works: Say Your Wish… (イマジンワークス SAY YOUR WISH…, Imajin Wākusu SAY YOUR WISH…?).