The Alternatives (オルタナティブ, Orutanatibu?) are fictional characters in the tokusatsu production of the TV series Kamen Rider Ryuki. They were mimicries of the 13 Kamen Riders and not considered true Kamen Riders, only Rider-like, as its wearers do not acknowledge themselves as Kamen Riders. Two Alternative suits were known to have been produced - a production model called Alternative and a prototype called Alternative Zero (オルタナティブ・ゼロ, Orutanatibu Zero?). Alternative and Alternative Zero's true identities were, respectively Hajime Nakamura and Hideyuki Kagawa. Along with Kamen Rider Tiger, the two were fighting to close the Mirror World and opposed Kanzaki's Rider War.

The two suits were identical except for a few minor differences. Alternative Zero's suit had blue accents and black cables while Alternative's had orange accents and silver cables. Alternative Zero was also decorated with silver stripes labeled "Trial Prototype-00" on both sides of the body. Because they are modeled after crickets, the Alternatives resemble the older Kamen Riders such as Kamen Rider V3 and Kamen Rider Super-1 in terms of appearance. Alternative Zero and Alternative were both killed the same way, Tiger betrayed them and destroyed their decks, causing them to dissolve in the Mirror World.